🌱 Fix/fix pr verify (#227)

* Use kubebuilder-pr-verify directly rather than -release-tools.
  The latter is outdated and included a reference to grc.io that broke.
  So use directly a working container.
* Fix syntax.
* Old pr-verify won't work any more.
  Follow advice from
  https://github.com/kubernetes-sigs/kubebuilder-release-tools#pr-verification-github-action-deprecated

Signed-off-by: Kurt Garloff <kurt@garloff.de>

Author: garloff

.github/workflows/pr-verify.yml

@@ -0,0 +1,42 @@
+name: "PR Title Verifier"
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+
+permissions: {}
+
+jobs:
+  verify:
+    permissions:
+      contents: read
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Validate PR Title Format
+        env:
+          TITLE: ${{ github.event.pull_request.title }}
+        run: |
+          if [[ -z "$TITLE" ]]; then
+            echo "Error: PR title cannot be empty."
+            exit 1
+          fi
+
+          if ! [[ "$TITLE" =~ ^($'\u26A0'|$'\u2728'|$'\U0001F41B'|$'\U0001F4D6'|$'\U0001F680'|$'\U0001F331') ]]; then
+            echo "Error: Invalid PR title format."
+            echo "Your PR title must start with one of the following indicators:"
+            echo "- Breaking change: ⚠ (U+26A0)"
+            echo "- Non-breaking feature: ✨ (U+2728)"
+            echo "- Patch fix: 🐛 (U+1F41B)"
+            echo "- Docs: 📖 (U+1F4D6)"
+            echo "- Release: 🚀 (U+1F680)"
+            echo "- Infra/Tests/Other: 🌱 (U+1F331)"
+            exit 1
+          fi
+
+          echo "PR title is valid: '$TITLE'"