Add format workflow

Author: Guilherme Souza

.github/workflows/format.yml

@@ -0,0 +1,25 @@
+name: Format
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  swift_format:
+    name: swift-format
+    runs-on: macOS-11
+    steps:
+      - uses: actions/checkout@v2
+      - name: Tap
+        run: brew tap pointfreeco/formulae
+      - name: Install
+        run: brew install Formulae/[email protected]
+      - name: Format
+        run: swift format -i -r --ignore-unparsable-files .
+      - uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: Run swift-format
+          branch: 'master'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}