DocC + swift-format (#765)

* DocC and swift-format support

* wip

* wip

* wip

Author: stephencelis

.github/workflows/format.yml

@@ -0,0 +1,29 @@
+name: Format
+
+on:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: format-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  swift_format:
+    name: swift-format
+    runs-on: macos-12
+    steps:
+      - uses: actions/checkout@v3
+      - name: Xcode Select
+        run: sudo xcode-select -s /Applications/Xcode_14.3.1.app
+      - name: Install
+        run: brew install swift-format
+      - name: Format
+        run: make format
+      - uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: Run swift-format
+          branch: 'main'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}