feat(copier): add support for batching files in single PR and to use PR template

examples-copier/.dockerignore

@@ -0,0 +1,51 @@
+# Git
+.git
+.gitignore
+.github
+
+# Documentation
+*.md
+!README.md
+docs/
+readme_files/
+
+# Test files
+*_test.go
+test-payloads/
+tests/
+
+# Config examples (not needed in container)
+configs/*.example
+configs/*.production
+configs/README.md
+configs/.env*
+
+# Scripts (not needed in container)
+scripts/
+
+# Build artifacts
+*.log
+all.log
+
+# Environment files (will be set via Cloud Run env vars)
+.env
+.env.*
+env.yaml
+env-cloudrun.yaml
+app.yaml
+
+# IDE
+.vscode
+.idea
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Temporary files
+tmp/
+temp/
+

examples-copier/.gitignore

@@ -1,6 +1,7 @@
 # Binaries
 examples-copier
 code-copier
+copier
 *.exe
 *.exe~
 *.dll
@@ -19,13 +20,23 @@ vendor/
 # Go workspace file
 go.work
 
-# Environment files with secrets
+# Environment files with secrets (working files - create from templates in configs/)
+# Working files (create from templates):
+#   env.yaml - App Engine deployment config (from configs/env.yaml.*)
+#   env-cloudrun.yaml - Cloud Run deployment config (from configs/env.yaml.*)
+#   .env - Local development config (from configs/.env.local.example)
 env.yaml
+env-cloudrun.yaml
 .env
 .env.local
 .env.production
 .env.*.local
 
+# Explicitly keep template files in configs/ directory (these should be tracked)
+!configs/env.yaml.example
+!configs/env.yaml.production
+!configs/.env.local.example
+
 # Private keys
 *.pem
 *.key
@@ -47,5 +58,3 @@ Thumbs.db
 # Temporary files
 tmp/
 temp/
-
-env.yaml

examples-copier/Dockerfile

@@ -0,0 +1,38 @@
+# Build stage
+FROM golang:1.23.4-alpine AS builder
+
+# Install build dependencies
+RUN apk add --no-cache git ca-certificates
+
+WORKDIR /app
+
+# Copy go mod files first for better caching
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+# Build the binary
+# CGO_ENABLED=0 for static binary (no C dependencies)
+# -ldflags="-w -s" strips debug info to reduce size
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o examples-copier .
+
+# Runtime stage
+FROM alpine:latest
+
+# Install ca-certificates for HTTPS requests
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /root/
+
+# Copy binary from builder
+COPY --from=builder /app/examples-copier .
+
+# Cloud Run sets PORT environment variable
+# Our app reads it from config.Port (defaults to 8080)
+EXPOSE 8080
+
+# Run the binary
+CMD ["./examples-copier"]
+

examples-copier/QUICK-REFERENCE.md

@@ -31,7 +31,7 @@
 ./config-validator test-pattern -type regex -pattern "^examples/(?P<lang>[^/]+)/.*$" -file "examples/go/main.go"
 
 # Test transformation
-./config-validator test-transform -template "docs/${lang}/${file}" -file "examples/go/main.go" -pattern "^examples/(?P<lang>[^/]+)/(?P<file>.+)$"
+./config-validator test-transform -source "examples/go/main.go" -template "docs/${lang}/${file}" -vars "lang=go,file=main.go"
 
 # Initialize new config
 ./config-validator init -output copier-config.yaml
@@ -63,6 +63,18 @@ source_pattern:
   pattern: "^examples/(?P<lang>[^/]+)/(?P<file>.+)$"
 ```
 
+### Pattern with Exclusions
+```yaml
+source_pattern:
+  type: "prefix"
+  pattern: "examples/"
+  exclude_patterns:
+    - "\.gitignore$"
+    - "node_modules/"
+    - "\.env$"
+    - "/dist/"
+```
+
 ## Path Transformations
 
 ### Built-in Variables
@@ -102,9 +114,73 @@ commit_strategy:
   commit_message: "Update examples"
   pr_title: "Update code examples"
   pr_body: "Automated update"
+  use_pr_template: true  # Fetch PR template from target repo
   auto_merge: true
 ```
 
+### Batch PRs by Repository
+```yaml
+batch_by_repo: true
+
+batch_pr_config:
+  pr_title: "Update from ${source_repo}"
+  pr_body: |
+    🤖 Automated update
+    Files: ${file_count}
+  use_pr_template: true
+  commit_message: "Update from ${source_repo} PR #${pr_number}"
+```
+
+## Advanced Features
+
+### Exclude Patterns
+Exclude unwanted files from being copied:
+
+```yaml
+source_pattern:
+  type: "prefix"
+  pattern: "examples/"
+  exclude_patterns:
+    - "\.gitignore$"      # Exclude .gitignore
+    - "node_modules/"     # Exclude dependencies
+    - "\.env$"            # Exclude .env files
+    - "\.env\\..*$"       # Exclude .env.local, .env.production, etc.
+    - "/dist/"            # Exclude build output
+    - "/build/"           # Exclude build artifacts
+    - "\.test\.(js|ts)$"  # Exclude test files
+```
+
+### PR Template Integration
+Fetch and merge PR templates from target repos:
+
+```yaml
+commit_strategy:
+  type: "pull_request"
+  pr_body: |
+    🤖 Automated update
+    Files: ${file_count}
+  use_pr_template: true  # Fetches .github/pull_request_template.md
+```
+
+**Result:** PR description shows:
+1. Target repo's PR template (checklists, guidelines)
+2. Separator (`---`)
+3. Your configured content (automation info)
+
+### Batch Configuration
+When `batch_by_repo: true`, use `batch_pr_config` for accurate file counts:
+
+```yaml
+batch_by_repo: true
+
+batch_pr_config:
+  pr_title: "Update from ${source_repo}"
+  pr_body: |
+    Files: ${file_count}  # Accurate count across all rules
+    Source: ${source_repo} PR #${pr_number}
+  use_pr_template: true
+```
+
 ## Message Templates
 
 ### Available Variables

examples-copier/README.md

@@ -1,6 +1,8 @@
 # GitHub Docs Code Example Copier
 
-A GitHub app that automatically copies code examples and files from a source repository to one or more target repositories when pull requests are merged. Features advanced pattern matching, path transformations, audit logging, and comprehensive monitoring.
+A GitHub app that automatically copies code examples and files from a source repository to one or more target 
+repositories when pull requests are merged. Features advanced pattern matching, path transformations, audit logging, 
+and comprehensive monitoring.
 
 ## Features
 
@@ -15,6 +17,9 @@ A GitHub app that automatically copies code examples and files from a source rep
 ### Enhanced Features
 - **YAML Configuration** - Modern YAML config with JSON backward compatibility
 - **Message Templating** - Template-ized commit messages and PR titles
+- **Batch PR Support** - Combine multiple rules into one PR per target repo
+- **PR Template Integration** - Fetch and merge PR templates from target repos
+- **File Exclusion** - Exclude patterns to filter out unwanted files (`.gitignore`, `node_modules`, etc.)
 - **Audit Logging** - MongoDB-based event tracking for all operations
 - **Health & Metrics** - `/health` and `/metrics` endpoints for monitoring
 - **Development Tools** - Dry-run mode, CLI validation, enhanced logging
@@ -46,7 +51,7 @@ go build -o examples-copier .
 go build -o config-validator ./cmd/config-validator
 ```
 
-### Configuration
+### Local Configuration
 
 1. **Copy environment example file**
 
@@ -96,12 +101,28 @@ Create `copier-config.yaml` in your source repository:
 ```yaml
 source_repo: "your-org/source-repo"
 source_branch: "main"
+batch_by_repo: true  # Optional: batch all changes into one PR per target repo
+
+# Optional: Customize batched PR metadata
+batch_pr_config:
+  pr_title: "Update code examples from ${source_repo}"
+  pr_body: |
+    🤖 Automated update of code examples
+
+    **Source:** ${source_repo} PR #${pr_number}
+    **Files:** ${file_count}
+  use_pr_template: true  # Fetch PR template from target repos
+  commit_message: "Update examples from ${source_repo} PR #${pr_number}"
 
 copy_rules:
   - name: "Copy Go examples"
     source_pattern:
       type: "regex"
       pattern: "^examples/(?P<lang>[^/]+)/(?P<category>[^/]+)/(?P<file>.+)$"
+      exclude_patterns:  # Optional: exclude unwanted files
+        - "\.gitignore$"
+        - "node_modules/"
+        - "\.env$"
     targets:
       - repo: "your-org/target-repo"
         branch: "main"
@@ -110,6 +131,8 @@ copy_rules:
           type: "pull_request"
           commit_message: "Update ${category} examples from ${lang}"
           pr_title: "Update ${category} examples"
+          pr_body: "Automated update of ${lang} examples"
+          use_pr_template: true  # Merge with target repo's PR template
           auto_merge: false
         deprecation_check:
           enabled: true
@@ -203,9 +226,71 @@ commit_strategy:
   commit_message: "Update examples"
   pr_title: "Update ${category} examples"
   pr_body: "Automated update from ${source_repo}"
+  use_pr_template: true  # Fetch and merge PR template from target repo
   auto_merge: true
 ```
 
+### Advanced Features
+
+#### Batch PRs by Repository
+
+Combine all changes from a single source PR into one PR per target repository:
+
+```yaml
+batch_by_repo: true
+
+batch_pr_config:
+  pr_title: "Update code examples from ${source_repo}"
+  pr_body: |
+    🤖 Automated update
+
+    Files: ${file_count}
+    Source: ${source_repo} PR #${pr_number}
+  use_pr_template: true
+  commit_message: "Update from ${source_repo} PR #${pr_number}"
+```
+
+**Benefits:**
+- Single PR per target repo instead of multiple PRs
+- Accurate `${file_count}` across all matched rules
+- Easier review process for related changes
+
+#### PR Template Integration
+
+Automatically fetch and merge PR templates from target repositories:
+
+```yaml
+commit_strategy:
+  type: "pull_request"
+  pr_body: |
+    🤖 Automated update
+    Files: ${file_count}
+  use_pr_template: true  # Fetches .github/pull_request_template.md
+```
+
+**Result:** PR description shows the target repo's template first (with checklists and guidelines), followed by your configured content.
+
+#### File Exclusion Patterns
+
+Exclude unwanted files from being copied:
+
+```yaml
+source_pattern:
+  type: "prefix"
+  pattern: "examples/"
+  exclude_patterns:
+    - "\.gitignore$"      # Exclude .gitignore files
+    - "node_modules/"     # Exclude dependencies
+    - "\.env$"            # Exclude environment files
+    - "/dist/"            # Exclude build artifacts
+    - "\.test\.(js|ts)$"  # Exclude test files
+```
+
+**Use cases:**
+- Filter out configuration files
+- Exclude build artifacts and dependencies
+- Skip test files or documentation
+
 ### Message Templates
 
 Use variables in commit messages and PR titles:
@@ -432,7 +517,7 @@ container := NewServiceContainer(config)
 
 ## Deployment
 
-See [DEPLOYMENT.md](./docs/DEPLOYMENT.md) for complete deployment guide and [DEPLOYMENT-CHECKLIST.md](./docs/DEPLOYMENT-CHECKLIST.md) for step-by-step checklist.
+See [DEPLOYMENT.md](./docs/DEPLOYMENT.md) for complete deployment guide for step-by-step checklist.
 
 ### Google Cloud App Engine
 

examples-copier/cmd/test-webhook/main.go

@@ -86,7 +86,7 @@ func main() {
 }
 
 func printHelp() {
-	fmt.Println(`Test Webhook Tool
+	fmt.Print(`Test Webhook Tool
 
 Usage:
   test-webhook [options]