ci: add test workflow

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: '3.3.10'
+          channel: 'stable'
+      - name: Dependencies
+        run: flutter pub get
+      - name: Build generated files
+        run: flutter pub run build_runner build -d
+      - name: Analyze
+        run: flutter analyze
+      - name: Test
+        run: flutter test

README.md

@@ -1,5 +1,7 @@
 # LocalSend
 
+![ci](https://github.com/localsend/localsend/actions/workflows/ci.yml/badge.svg)
+
 Links: [Homepage](https://localsend.org)
 | [Play Store](https://play.google.com/store/apps/details?id=org.localsend.localsend_app)
 | [App Store](https://apps.apple.com/us/app/localsend/id1661733229)