Build citool outside source code

To avoid tidy errors.

Author: Kobzol

.github/workflows/ci.yml

@@ -177,10 +177,11 @@ jobs:
         run: src/ci/scripts/verify-stable-version-number.sh
 
       # Pre-build citool before the following step uninstalls rustup
+      # Build is into the build directory, to avoid modifying sources
       - name: build citool
         run: |
           cd src/ci/citool
-          cargo build
+          CARGO_TARGET_DIR=../../../build/citool cargo build
 
       - name: run the build
         # Redirect stderr to stdout to avoid reordering the two streams in the GHA logs.
@@ -223,7 +224,7 @@ jobs:
         env:
           DATADOG_API_KEY: ${{ secrets.DATADOG_API_KEY }}
           DD_GITHUB_JOB_NAME: ${{ matrix.full_name }}
-        run: ./src/ci/citool/target/debug/citool upload-build-metrics build/cpu-usage.csv
+        run: ./build/citool/debug/citool upload-build-metrics build/cpu-usage.csv
 
   # This job isused to tell bors the final status of the build, as there is no practical way to detect
   # when a workflow is successful listening to webhooks only in our current bors implementation (homu).