add git workflows for test and build

Author: posthello-code

.github/workflows/build.yaml

@@ -0,0 +1,15 @@
+name: Dart
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dart-lang/setup-dart@v1
+
+      - run: dart pub get
+      - run: ./build.sh

.github/workflows/test.yaml

@@ -3,8 +3,6 @@ name: Dart
 on:
   pull_request:
     branches: [main]
-  push:
-    branches: [main]
 
 jobs:
   build: