Create CI GitHub workflow

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: ci
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  linting:
+    name: Linting & Formatting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.19.x'
+          channel: "stable"
+          cache: true
+          cache-key: 'flutter-:os:-:channel:-:version:-:arch:-:hash:' # optional, change this to force refresh cache
+          cache-path: '${{ runner.tool_cache }}/flutter/:channel:-:version:-:arch:' # optional, change this to specify the cache path
+          architecture: x64 # optional, x64 or arm64
+
+      - name: Dependencies
+        run: flutter pub get
+
+      - name: Linting
+        # We'll ignore info and warnings when performing this step
+        run: flutter analyze --no-fatal-infos --no-fatal-warnings
+
+      - name: Formatting
+        run: dart format --set-exit-if-changed -l 200 .
+
+      - name: Tests
+        run: flutter test