Create build.yml

Create workflow to build andriod app using Kivy buildozer

.github/workflows/build.yml

@@ -0,0 +1,54 @@
+name: Build
+on:
+  push:
+    branches-ignore:
+      - data
+      - gh-pages
+    tags:
+      - '**'
+  pull_request:
+    branches-ignore:
+      - data
+      - gh-pages
+
+jobs:
+  # Build job. Builds app for Android with Buildozer
+  build-android:
+    name: Build for Android
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          path: master
+
+      - name: Build with Buildozer
+        uses: ArtemSBulgakov/buildozer-action@v1
+        id: buildozer
+        with:
+          repository_root: master
+          workdir: test_app
+          buildozer_version: stable
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          name: package
+          path: ${{ steps.buildozer.outputs.filename }}
+
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          path: data
+          ref: data # Branch name
+
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.7
+          architecture: x64
+
+      - name: Push binary to data branch
+        if: github.event_name == 'push'
+        run: python master/.ci/move_binary.py "${{ steps.buildozer.outputs.filename }}" master data bin