Experiment with linting and testing using Github actions (#3728)

Create an action that lints, tests, and builds the green debug variant.

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    tags:
+      - '*'
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - uses: actions/setup-java@v3
+        with:
+          java-version: '11'
+          distribution: 'temurin'
+
+      - name: Gradle Wrapper Validation
+        uses: gradle/wrapper-validation-action@v1
+
+      - name: Gradle Build Action
+        uses: gradle/gradle-build-action@v2
+  
+      - name: ktlint
+        run: ./gradlew clean ktlintCheck
+        
+      - name: Regular lint
+        run: ./gradlew lintGreenDebug
+        
+      - name: Test
+        run: ./gradlew app:testGreenDebugUnitTest
+        
+      - name: Build
+        run: ./gradlew app:greenDebug