Add Android CI

.github/workflows/android.yml

@@ -0,0 +1,35 @@
+name: Android CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: macOS-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Install Swift toolchain 5.0.3 
+      run: wget https://swift.org/builds/swift-5.0.3-release/xcode/swift-5.0.3-RELEASE/swift-5.0.3-RELEASE-osx.pkg;
+        sudo installer -pkg swift-5.0.3-RELEASE-osx.pkg -target /
+    - name: Install NDK
+      run: wget https://dl.google.com/android/repository/android-ndk-r17c-darwin-x86_64.zip;
+        unzip android-ndk-r17c-darwin-x86_64.zip
+    - name: Install Swift Android Toolchain
+      run: SWIFT_ANDROID=$(curl -fsSL https://api.bintray.com/packages/readdle/swift-android-toolchain/swift-android-toolchain/versions/_latest | python -c 'import json,sys;print(json.load(sys.stdin))["name"]');
+        wget https://dl.bintray.com/readdle/swift-android-toolchain/swift-android-$SWIFT_ANDROID.zip;
+        unzip swift-android-$SWIFT_ANDROID.zip;
+        swift-android-$SWIFT_ANDROID/bin/swift-android tools --update;
+        ln -sfn swift-android-$SWIFT_ANDROID swift-android-current
+    - name: Gradle build
+      run: export TOOLCHAINS=org.swift.50320190830a;
+        export ANDROID_NDK_HOME=$(pwd)/android-ndk-r17c;
+        export SWIFT_ANDROID_HOME=$(pwd)/swift-android-current;
+        export PATH=$ANDROID_NDK_HOME:$PATH;
+        export PATH=$SWIFT_ANDROID_HOME/bin:$SWIFT_ANDROID_HOME/build-tools/current:$PATH;
+        cd todoapp;
+        ./gradlew app:assembleMockDebug