ci: PR checks with central-config validation

.gitea/workflows/pr.yaml

@@ -0,0 +1,28 @@
+name: PR Checks
+on:
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+  # validate the consumer-facing workflows答复 lint (YAML/structure)
+  hadolint-shim:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Lint the workflow yaml files
+        run: |
+          # Just ensure the yaml files parse and each uses supported fields
+          python3 - <<'EOF'
+          import sys, yaml, glob
+          bad = 0
+          for f in glob.glob('.gitea/workflows/*.yaml'):
+              with open(f) as fh:
+                  yaml.safe_load(fh.read())
+              print(f, 'ok')
+          sys.exit(1 if bad else 0)
+          EOF
+
+  # Validate the CENTRAL config.json itself with renovate-config-validator
+  validate-central-config:
+    uses: ./.gitea/workflows/validate.yaml
+    with:
+      config_path: config.json