Add basic android workflow

Author: CAMOBAP

.github/workflows/android.yml

@@ -0,0 +1,65 @@
+name: ci
+
+on:
+  push:
+    branches: [ main ]
+    tags: [ 'v*' ]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+
+      - run: ./gradlew lint --stacktrace
+
+  apk:
+    needs: test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+
+      - run: ./gradlew assembleRelease --stacktrace
+
+      - uses: actions/upload-artifact@v1
+        with:
+          name: apk
+          path: app/build/outputs/apk/release/app-release.apk
+
+  release:
+    if: startsWith(github.ref, 'refs/tags/v')
+    needs: apk
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/download-artifact@v2
+        with:
+          name: apk
+
+      - id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }} 
+
+      - uses: actions/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: app-release.apk
+          asset_name: ImageMixer.apk
+          asset_content_type: application/zip