add github workflows

.github/workflows/build_dev.yml

@@ -0,0 +1,19 @@
+name: Build main
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build_dev:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Build
+        uses: oleksiikutuzov/flipperzero-ufbt-action@v1
+        with:
+          channel: dev