Add GitHub Release job to workflow

- Added Release job that depends on Release-Build
- Downloads all build artifacts and attaches to GitHub release
- Only runs on tag pushes (not manual workflow_dispatch)
- Generates release notes automatically
- Marks test tags as prerelease
- Phase 6 of incremental release pipeline

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: dpastoor

.github/workflows/release.yml

@@ -6,7 +6,7 @@ on:
   workflow_dispatch:
 
 permissions:
-  contents: read
+  contents: write
 
 jobs:
   Release-Build:
@@ -82,3 +82,42 @@ jobs:
           path: ${{ env.ARTIFACT_NAME }}
           if-no-files-found: error
           retention-days: 7
+
+  Release:
+    needs: [Release-Build]
+    runs-on: ubuntu-latest
+    if: ${{ github.ref_type == 'tag' }}
+    permissions:
+      contents: write
+
+    steps:
+      - name: Ensure artifacts dir exists
+        run: mkdir -p artifacts
+
+      - name: Download Artifacts
+        uses: actions/download-artifact@v4
+        with:
+          path: artifacts
+          merge-multiple: true
+
+      - name: List downloaded artifacts
+        run: ls -lah artifacts/
+
+      - name: Release
+        uses: softprops/action-gh-release@c062e08bd532815e2082a85e87e3ef29c3e6d191
+        with:
+          name: ${{ github.ref_name }}
+          tag_name: ${{ github.ref_name }}
+          generate_release_notes: true
+          fail_on_unmatched_files: true
+          body: |
+            Welcome to release ${{ github.ref_name }} of test-build-processes!
+
+            **Build targets:**
+            - `x86_64-unknown-linux-gnu`: Built on AlmaLinux 8 (glibc 2.28) for broad compatibility
+            - `aarch64-unknown-linux-gnu`: Built on AlmaLinux 8 (glibc 2.28) for ARM64 systems
+
+            All binaries are dynamically linked against glibc 2.28+.
+          token: ${{ secrets.GITHUB_TOKEN }}
+          prerelease: ${{ contains(github.ref, '-pre') || contains(github.ref, '-test') }}
+          files: artifacts/*