Add compliance action

Check if the commits of a pull request can be cherry-picked to
the master, which is the kiwi v9.x.x code stream.

.github/workflows/ci-kiwi-9-compliant.yml

@@ -0,0 +1,14 @@
+name: CI-Compliant-To-Kiwi-9
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  compliance_test:
+    name: Capable for Rebase to kiwi v9.x.x
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run rebase
+        run: sudo apt upgrade; git --version; git fetch --all; git config user.email [email protected]; git config user.name git_action; git checkout master; git cherry-pick 'main..${GITHUB_HEAD_REF}'