Merge pull request #24 from ankit2001/add_github_actions

Add basic github actions (Issue, Matrix, bundler, dependabot)

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: "bundler"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflow/app-bundle.yml

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+steps:
+- uses: actions/checkout@v2
+- uses: actions/setup-java@v1
+  with:
+    java-version: '12.x'
+- uses: subosito/flutter-action@v1
+  with:
+    flutter-version: '1.22.4'
+- run: flutter pub get
+- run: flutter test
+- run: flutter build appbundle

.github/workflow/issue-assign.yml

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+name: "Issue assigner"
+
+on: [issues, issue_comment]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: Bugheist/issue-assigner@main
+      with:
+        GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"

.github/workflow/matrix-test.yml

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+jobs:
+  test:
+    name: Test on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: '12.x'
+      - uses: subosito/flutter-action@v1
+        with:
+          flutter-version: '1.20.2'
+          channel: 'beta'
+      - run: dart --version
+      - run: flutter --version
+      - run: flutter pub get
+      - run: flutter test
+      - run: flutter build apk