ci(dev-freeze): Use GitHub Action for PR comments

GitHub Action `devel-freezer` helps with development freeze notifications
during the RC phase. It will create comments using predefined messages on
newly created and updated PRs when the RC tag has been released.
Also, it will update comments once a new major version has been released.

Documentation available at: https://github.com/redhat-plumbers-in-action/devel-freezer

.github/development-freeze.yml

@@ -0,0 +1,12 @@
+# syntax - https://github.com/redhat-plumbers-in-action/devel-freezer#policy
+---
+
+policy:
+  # tags like v253-rc1, v253-rc2, etc.
+  - tags: ['^\S*-rc\d+$']
+    feedback:
+      frozen-state: |
+        An -rc1 tag has been created and a release is being prepared, so please note that PRs introducing new features and APIs will be held back until the new version has been released.
+      unfreeze-state: |
+        We had successfully released a new major release. We are no longer in a development freeze phase.
+        We will try our best to get back to your PR as soon as possible. Thank you for your patience.

.github/pull_request_template.md.disabled

@@ -1,5 +0,0 @@
-# CODE FREEZE NOTICE
-
-An -rc1 tag has been created and a release is being prepared, so please note that
-PRs introducing new features and APIs will be held back until the new version
-has been released.

.github/workflows/development_freeze.yml

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+# doc: https://github.com/redhat-plumbers-in-action/devel-freezer#readme
+---
+
+name: Development Freeze
+on:
+  pull_request:
+    types: [ opened, reopened, synchronize ]
+    branches: [ main ]
+
+permissions:
+  contents: read
+
+jobs:
+  freezer:
+    runs-on: ubuntu-22.04
+
+    permissions:
+      pull-requests: write
+
+    steps:
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
+        with:
+          fetch-depth: 0
+
+      - name: Development Freezer
+        uses: redhat-plumbers-in-action/devel-freezer@1bce2d1d64db1a22f13cd6e4bff0b4f3847236c7
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}