Merge pull request #64 from woocommerce/add/automerge-action

packages/github-actions/actions/automerge-released-trunk/README.md

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+# Auto merge a released trunk
+
+This action provides the following functionality for GitHub Actions users:
+
+- Automatically merge trunk to develop after a release done with the `woocommerce/grow/prepare-extension-release`
+
+## Usage
+
+See [action.yml](action.yml)
+
+#### Basic:
+
+```yaml
+name: Auto merge a released trunk
+
+on:
+  pull_request:
+    types:
+      - closed
+    branches:
+      - trunk
+
+jobs:
+  automerge_trunk:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: woocommerce/grow/automerge-released-trunk@actions-v1
+```

packages/github-actions/actions/automerge-released-trunk/action.yml

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+name: Auto merge a released trunk
+description: Automatically merge trunk to develop after a release.
+
+runs:
+  using: composite
+  steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: "Merge the release to develop"
+      shell: bash
+      if: ${{ github.event.pull_request.merged == true && startsWith(github.head_ref, 'release/') && github.event.pull_request.user.login == 'github-actions[bot]' }}
+      # Use the github-actions bot account to commit.
+      # https://api.github.com/users/github-actions%5Bbot%5D
+      run: |
+        git config user.name github-actions[bot]
+        git config user.email 41898282+github-actions[bot]@users.noreply.github.com
+        git fetch origin develop trunk --unshallow --no-tags
+        git checkout develop
+        git merge --no-ff origin/trunk -m "Automerge ${{ github.head_ref }} from trunk to develop"
+        git push