ci: add github ci

.github/workflows/ci.yml

@@ -0,0 +1,45 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  FLUTTER_VERSION: "3.22.3"
+
+jobs:
+  format:
+    name: Format
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: ${{ env.FLUTTER_VERSION }}
+          channel: "stable"
+
+      - name: Dependencies
+        run: flutter pub get
+      - name: Check format
+        run: dart format --set-exit-if-changed lib bin test
+      - name: Analyze
+        run: flutter analyze
+
+  test:
+    name: Test (newest Flutter version)
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: ${{ env.FLUTTER_VERSION }}
+          channel: "stable"
+
+      - name: Dependencies
+        run: flutter pub get
+      - name: Test
+        run: flutter test