Show diff and archive generated files in case of chnages

Author: dala318

.github/workflows/ci.yml

@@ -126,13 +126,19 @@ jobs:
             echo "You have altered the generated proto files but they do not match what is expected."
             echo "Please run the following to update the generated files:"
             echo 'docker run -v "$PWD":/aioesphomeapi ghcr.io/esphome/aioesphomeapi-proto-builder:latest'
-            echo "The diff is:"
-            git diff
             exit 1
           fi
         name: Check protobuf files match
         if: ${{ matrix.python-version == '3.12' && matrix.extension == 'skip_cython' && matrix.os == 'ubuntu-latest' }}
-
+      - if: failure()
+        name: Show changes
+        run: git diff
+      - if: failure()
+        name: Archive artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: genrated-proto-files
+          path: aioesphomeapi/*pb2.py
   benchmarks:
     name: Run benchmarks
     runs-on: ubuntu-22.04