feat: Create google-code-format.yml

Closes #6

.github/workflows/google-code-format.yml

@@ -0,0 +1,18 @@
+name: Format code
+
+on:
+  push:
+    branches: [ prod, staging ]
+  pull_request:
+    branches: [ main, staging ]
+
+jobs:
+
+  formatting:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3 # v2 minimum required
+      - uses: axel-op/googlejavaformat-action@v3
+        with:
+          args: "--skip-sorting-imports --replace"
+