Added Github action.

.github/workflows/master.yml

@@ -1,4 +1,4 @@
-name: Android CI
+name: Android CI - Publish Apk
 
 on: 
   push:
@@ -10,13 +10,19 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
-      
+
       - name: set up JDK 1.8
         uses: actions/setup-java@v1
         with:
           java-version: 1.8
-      
+
+      - name: Make Gradle executable
+        run: chmod +x ./gradlew
+
       - name: Build with Gradle
+        run: ./gradlew build
+
+      - name: Build Debug APK
         run: ./gradlew assembleDebug
         
       - name: Debug APK Publisher