Setup Github Actions

.github/workflows/ci.yml

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+name: Android CI
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    # The type of runner that the job will run on
+    name: Run Unit Tests
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Java JDK
+        uses: actions/setup-java@v1.4.2
+        with:
+          java-version: 1.8
+      - name: Unit tests
+        run: bash ./gradlew test --stacktrace
+      - name: Kotlin Linter
+        uses: vroy/gha-kotlin-linter@v2
+
+  apk:
+    name: Generate APK
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Java JDK
+        uses: actions/setup-java@v1.4.2
+        with:
+          java-version: 1.8
+      - name: Build debug APK
+        run: bash ./gradlew assembleDebug --stacktrace
+      - name: Upload APK
+        uses: actions/upload-artifact@v1
+        with:
+          name: app
+          path: app/build/outputs/apk/debug/app-debug.apk