Create android_master.yml

.github/workflows/android_master.yml

@@ -0,0 +1,23 @@
+name: Android Master
+
+on:
+  pull_request:
+    branches:
+      - 'master'
+  push:
+    branches:
+      - 'master'
+
+jobs:
+  Build:
+    name: Build
+    runs-on: ubuntu-18.04
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Build
+        run: bash ./tools/android/gradlew build