Add GitHub actions

Author: matthewnessworthy

box.json

@@ -8,6 +8,7 @@
         "vendor"
     ],
     "files": [
+        "stubs/.github/workflows/ringier-code-style.yml",
         ".php-cs-fixer.php",
         ".phpcs.xml",
         ".styleci.yml",

builds/.gitkeep

@@ -0,0 +1,52 @@
+name: ringier-code-style
+
+on:
+  pull_request:
+
+jobs:
+  ringier-code-style:
+    runs-on: ubuntu-latest
+
+    permissions:
+      # Give the default GITHUB_TOKEN write permission to commit and push the changed files back to the repository.
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          ref: ${{ github.head_ref }}
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.1
+          tools: composer:v2
+
+      - name: Get Composer Cache Directory
+        id: composer-cache
+        run: |
+          echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+      - name: Install dependencies
+        run: composer global require ringierimu/ringier-code-style
+
+      - name: Setup config files
+        run: ringier-code-style config:dump --all --quiet
+
+      - name: Get changed php files
+        id: changed-files
+        uses: tj-actions/changed-files@v35
+        with:
+          files: |
+            **/*.php
+
+      - name: Run step if any php file(s) changed
+        if: steps.changed-files.outputs.any_changed == 'true'
+        run: |
+          for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
+            ringier-code-style fix "$file"
+          done
+
+      - uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: Apply ringier-code-style changes