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ci: add a check for the target branch on PRs #1672

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ci: add a check for the target branch on PRs #1672

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31 changes: 31 additions & 0 deletions .github/workflows/check-pr-target-branch.yml
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name: Check PR target branch

on:
pull_request:
types: [opened, edited, reopened, synchronize, ready_for_review]

permissions: {}

jobs:
check-pr-target-branch:
name: Check PR target branch
runs-on: ubuntu-slim

steps:
- name: Validate source and target branch
shell: bash
env:
SOURCE_BRANCH: ${{ github.event.pull_request.head.ref }}
TARGET_BRANCH: ${{ github.event.pull_request.base.ref }}
run: |
echo "Source branch: ${SOURCE_BRANCH}"
echo "Target branch: ${TARGET_BRANCH}"

main_target_branch_regex='^[0-9]+\.[0-9]+\.[0-9]+/(release)$'

if [[ "${TARGET_BRANCH}" == "main" && ! "${SOURCE_BRANCH}" =~ ${main_target_branch_regex} ]]; then
echo "::warning title=Wrong PR target branch::Branch '${SOURCE_BRANCH}' targets 'main'. Only '<x.y.z>/release' branches are expected to target 'main'. Feature and fix branches should target their matching release branch instead, for example '2.5.2/release'."
exit 1
fi

echo "PR target branch looks OK."
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