Add support for GitHub Action CI

Author: onevdog

.github/workflows/build.yml

@@ -0,0 +1,28 @@
+name: build
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dart-lang/setup-dart@v1
+
+      - name: Install dependencies
+        run: dart pub get
+
+      # Consider passing '--fatal-infos' for slightly stricter analysis.
+      - name: Analyze project source
+        run: dart analyze --fatal-infos
+
+      # Your project will need to have tests in test/ and a dependency on
+      # package:test for this step to succeed. Note that Flutter projects will
+      # want to change this to 'flutter test'.
+      - name: Run tests
+        run: flutter test