4881: Add API spec check

Author: turegjorup

.github/workflows/api-spec.yaml.yml

@@ -0,0 +1,43 @@
+on:
+  pull_request:
+
+name: Validate API Spec changes
+
+jobs:
+  detect-breaking-changes:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out BASE rev
+        uses: actions/checkout@v5
+        with:
+          ref: ${{ github.base_ref }}
+          path: base
+
+      - name: Check out HEAD rev
+        uses: actions/checkout@v5
+        with:
+          ref: ${{ github.head_ref }}
+          path: head
+
+      # https://taskfile.dev/installation/#github-actions
+      - name: Setup go-tsak
+        uses: go-task/setup-task@v1
+
+      - name: Setup application
+        working-directory: head
+        run: |
+          docker network create frontend
+          task --yes site:update
+
+      - name: Export API specification
+        working-directory: head
+        run: |
+          task --yes api:spec:export
+
+#      - name: Check for changes in specification
+#        run: git diff --diff-filter=ACMRT --exit-code public/spec.yaml
+
+      - name: Run OpenAPI Diff (from HEAD rev)
+        uses: docker://openapitools/openapi-diff:latest
+        with:
+          args: --fail-on-incompatible base/public/spec.yaml head/public/spec.yaml