Merge pull request #19 from codefresh-io/CR-7081-add-pr-default-branch-check

add pr-check github action

Author: ilyagorban-codefresh

.github/workflows/default-branch-check.yaml

@@ -0,0 +1,18 @@
+name: PR check
+
+on:
+  pull_request:
+    branches:
+      - "release-*"
+
+jobs:
+  test-default-branch:
+    name: base branch is a default branch
+    runs-on: ubuntu-latest
+    steps:
+    - name: fail if base branch is not default branch
+      if: ${{ github.event.pull_request.base.ref != github.event.repository.default_branch }}
+      uses: actions/github-script@v3
+      with:
+        script: |
+            core.setFailed("Base branch of the PR - ${{ github.event.pull_request.base.ref }} is not a default branch. Please reopen your PR to ${{ github.event.repository.default_branch }}")