build: setup dart simple ci using github actions (#114)

packages/repo_support/.gitignore

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+# See https://www.dartlang.org/guides/libraries/private-files
+
+# Files and directories created by pub
+.dart_tool/
+.packages
+.pub/
+build/
+# If you're building an application, you may want to check-in your pubspec.lock
+pubspec.lock
+
+# Directory created by dartdoc
+# If you don't generate documentation locally you can remove this line.
+doc/api/
+
+# Intellij
+*.idea/
+*.iml
+
+# VS code
+.vscode
+
+# Local
+.local/

packages/repo_support/README.md

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+# repo_support
+
+App flutter utils repo support
+
+```
+dart run tool/run_ci.dart
+
+```

packages/repo_support/pubspec.yaml

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+name: simplex_repo_support
+description: SimpleX build tools
+version: 0.2.0
+publish_to: none
+
+environment:
+  sdk: '>=2.12.0 <3.0.0'
+
+dev_dependencies:
+  dev_test:
+

packages/repo_support/tool/run_ci.dart

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+// ignore_for_file: prefer_double_quotes
+
+import 'package:dev_test/package.dart';
+import 'package:path/path.dart';
+
+Future main() async {
+  for (var dir in [
+    'simplex_app',
+    'simplexmq',
+    'repo_support',
+  ]) {
+    await packageRunCi(join('..', dir));
+  }
+}