misc(ci): detect breaking change to any .proto files or config fields in nodebuilder/**/config.go and add kind:break!

.github/workflows/labels.yml

@@ -17,3 +17,33 @@ jobs:
           mode: minimum
           count: 1
           labels: "kind:fix, kind:misc, kind:break!, kind:refactor, kind:feat, kind:deps, kind:docs, kind:ci, kind:chore, kind:testing" # yamllint disable-line rule:line-length
+
+  # will attempt to apply a breaking label
+  # on opening the PR but not enforce it on repeated changes
+  # so we don't get trapped by false positives (for now)
+  # we can expand to all cases after
+  apply-breaking:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.action == 'opened' && github.actor != 'dependabot[bot]' }}
+    permissions:
+      pull-requests: write
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Run check for breaking
+        id: breaking_change
+        run: |
+          git fetch origin main
+          make detect-breaking
+
+      - name: Add label if breaking changes detected
+        if: failure()
+        run: gh issue edit "$NUMBER" --add-label "$LABELS"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}
+          NUMBER: ${{ github.event.pull_request.number }}
+          LABELS: kind:break!

Makefile

@@ -230,6 +230,32 @@ goreleaser-release:
 	goreleaser release --clean --fail-fast --skip-publish
 .PHONY: goreleaser-release
 
+# detect changed files and parse output
+# to inspect changes to nodebuilder/**/config.go fields
+CHANGED_FILES      = $(shell git diff --name-only origin/main...HEAD)
+detect-breaking:
+	@BREAK=false
+	@for file in ${CHANGED_FILES}; do \
+		if echo $$file | grep -qE '\.proto$$'; then \
+			BREAK=true; \
+		fi; \
+		if echo $$file | grep -qE 'nodebuilder/.*/config\.go'; then \
+			DIFF_OUTPUT=$$(git diff origin/main...HEAD $$file); \
+			if echo "$$DIFF_OUTPUT" | grep -qE 'type Config struct|^\s+\w+\s+Config'; then \
+				BREAK=true; \
+			fi; \
+		fi; \
+	done; \
+	if [ "$$BREAK" = true ]; then \
+		echo "break detected"; \
+		exit 1; \
+	else \
+		echo "no break detected"; \
+		exit 0; \
+	fi
+.PHONY: detect-breaking
+
+
 # Copied from https://github.com/dgraph-io/badger/blob/main/Makefile
 USER_ID      = $(shell id -u)
 HAS_JEMALLOC = $(shell test -f /usr/local/lib/libjemalloc.a && echo "jemalloc")