Add a workflow to keep wp-cli/wp-cli up to date (#507)

* Add a workflow to keep `wp-cli/wp-cli` up to date

* Run on `push` while we're testing

* Revert "Run on `push` while we're testing"

This reverts commit 0dc5e79.

Author: danielbachhuber

.github/workflows/update-framework.yml

@@ -0,0 +1,89 @@
+name: Update wp-cli framework
+
+on:
+  workflow_call:
+
+# Cancels all previous workflow runs for the same branch that have not yet completed.
+concurrency:
+  # The concurrency group contains the workflow name and the branch name.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+
+jobs:
+
+  update-framework: #----------------------------------------------------------
+    name: Update wp-cli framework
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out source code
+        uses: actions/checkout@v3
+
+      - name: Set up PHP envirnoment
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '7.4'
+        env:
+          COMPOSER_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Check existence of composer.json file
+        id: check_composer_file
+        uses: andstor/file-existence-action@v2
+        with:
+          files: "composer.json"
+
+      - name: Install Composer dependencies & cache dependencies
+        if: steps.check_composer_file.outputs.files_exists == 'true'
+        uses: "ramsey/composer-install@v2"
+        env:
+          COMPOSER_ROOT_VERSION: dev-${{ github.event.repository.default_branch }}
+        with:
+          # Bust the cache at least once a month - output format: YYYY-MM.
+          custom-cache-suffix: $(date -u "+%Y-%m")
+
+      - name: Configure git user
+        run: |
+          git config --global user.email "alain.schlesser@gmail.com"
+          git config --global user.name "Alain Schlesser"
+
+      - name: Check if remote branch exists
+        run: echo "REMOTE_BRANCH_EXISTS=$([[ -z $(git ls-remote --heads origin update-framework) ]] && echo "0" || echo "1")" >> $GITHUB_ENV
+
+      - name: Create branch to base pull request on
+        if: env.REMOTE_BRANCH_EXISTS == 0
+        run: |
+          git checkout -b update-framework
+
+      - name: Fetch existing branch to add commits to
+        if: env.REMOTE_BRANCH_EXISTS == 1
+        run: |
+          git fetch --all --prune
+          git checkout update-framework
+          git pull --no-rebase
+
+      - name: Update wp-cli framework
+        run: |
+          composer update wp-cli/wp-cli
+
+      - name: Check if there are changes
+        run: echo "CHANGES_DETECTED=$([[ -z $(git status --porcelain) ]] && echo "0" || echo "1")" >> $GITHUB_ENV
+
+      - name: Commit changes
+        if: env.CHANGES_DETECTED == 1
+        run: |
+          git add composer.lock
+          git commit -m "Update wp-cli framework - $(date +'%Y-%m-%d')"
+          git push origin update-framework
+
+      - name: Create pull request
+        if: |
+          env.CHANGES_DETECTED == 1 &&
+          env.REMOTE_BRANCH_EXISTS == 0
+        uses: repo-sync/pull-request@v2
+        with:
+          source_branch: update-framework
+          destination_branch: ${{ github.event.repository.default_branch }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          pr_title: Update wp-cli framework
+          pr_body: "**This is an automated pull-request**\n\nUpdates the `wp-cli/wp-cli` framework to the latest changeset."
+          pr_label: scope:framework