Add a new job running danger as local to test it

.gitlab/ci/review.gitlab-ci.yml

@@ -247,10 +247,14 @@ danger-review:
   script:
     - >
       if [ -z "$DANGER_GITLAB_API_TOKEN" ]; then
-        # Force danger to skip CI source GitLab and fallback to "local only git repo".
-        unset GITLAB_CI
-        # We need to base SHA to help danger determine the base commit for this shallow clone.
-        run_timed_command "bundle exec danger dry_run --fail-on-errors=true --verbose --base='$CI_MERGE_REQUEST_DIFF_BASE_SHA'"
+        run_timed_command danger_as_local
       else
         run_timed_command "bundle exec danger --fail-on-errors=true --verbose"
       fi
+
+danger-review-local:
+  extends:
+    - danger-review
+    - .review:rules:danger-local
+  script:
+    - run_timed_command danger_as_local

.gitlab/ci/rules.gitlab-ci.yml

@@ -330,6 +330,12 @@
   - ".dockerignore"
   - "qa/**/*"
 
+.code-backstage-danger-patterns: &code-backstage-danger-patterns
+  # Backstage changes
+  - "Dangerfile"
+  - "danger/**/*"
+  - "tooling/danger/**/*"
+
 ################
 # Shared rules #
 ################
@@ -1284,6 +1290,11 @@
   rules:
     - if: '$CI_MERGE_REQUEST_IID'
 
+.review:rules:danger-local:
+  rules:
+    - if: '$CI_MERGE_REQUEST_IID'
+      changes: *code-backstage-danger-patterns
+
 ###############
 # Setup rules #
 ###############

scripts/utils.sh

@@ -134,3 +134,10 @@ function fail_pipeline_early() {
     scripts/api/cancel_pipeline.rb
   fi
 }
+
+function danger_as_local() {
+  # Force danger to skip CI source GitLab and fallback to "local only git repo".
+  unset GITLAB_CI
+  # We need to base SHA to help danger determine the base commit for this shallow clone.
+  bundle exec danger dry_run --fail-on-errors=true --verbose --base="${CI_MERGE_REQUEST_DIFF_BASE_SHA}"
+}