chore: add slack notification if fuzzing fails

Author: oetr

.github/workflows/fuzzing.yml

@@ -62,3 +62,17 @@ jobs:
         run: |
           mkdir -p ~/fuzzing-corpus/ArgumentsMutatorFuzzTest
           bazelisk run ${{env.BUILD_BUDDY_CONFIG}} --java_runtime_version=remotejdk_${{ matrix.jdk }} ${{ matrix.bazel_args }} ${{ matrix.extra_bazel_args }} //selffuzz/src/test/java/com/code_intelligence/selffuzz/mutation:ArgumentsMutatorFuzzTest --jvmopt=-Xmx8000m -- -runs=1000000 ~/fuzzing-corpus/ArgumentsMutatorFuzzTest
+
+  # Notification job that runs after all matrix jobs complete
+  notification:
+    needs: build_and_test
+    runs-on: ubuntu-24.04
+    if: failure()  # Run regardless of build_and_test outcome
+    steps:
+    - name: Slack notification on failure
+      run: |
+            curl -X POST -H 'Content-type: application/json' \
+            --data '{
+              "workflow_url": "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
+            }' \
+            ${{ secrets.SLACK_WEBHOOK_URL }}