ci: add ci for main branch (formatting only)

.github/workflows/ci-main.yml

@@ -0,0 +1,19 @@
+name: CI - Main
+
+on:
+    push:
+        branches:
+            - main
+
+jobs:
+    biome:
+        name: Check Formatting
+        timeout-minutes: 15
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Setup Biome
+              uses: biomejs/setup-biome@v2
+            - name: Run Biome
+              run: biome ci .