Add GitHub Actions workflow to run prettier

.github/workflows/linting.yml

@@ -0,0 +1,18 @@
+name: Lint code
+on:
+  push:
+    branches:
+      - master
+      - astro
+  pull_request:
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+      - run: npm install --only=dev
+      - uses: pre-commit/action@v3.0.1