Basic config for to build android apk on Gitlab CI

.gitlab-ci.yml

image: openjdk:8-jdk

variables:
  ANDROID_COMPILE_SDK: "25"
  ANDROID_BUILD_TOOLS: "25.0.3"
  ANDROID_SDK_TOOLS_REV: "3859397" #https://developer.android.com/studio/index.html#downloads

before_script:
  - apt-get --quiet update --yes
  - apt-get --quiet install --yes wget tar unzip lib32stdc++6 lib32z1
  - wget --quiet --output-document=android-sdk.zip https://dl.google.com/android/repository/sdk-tools-linux-${ANDROID_SDK_TOOLS_REV}.zip
  - mkdir $PWD/android-sdk-linux
  - unzip -qq android-sdk.zip -d $PWD/android-sdk-linux
  - export ANDROID_HOME=$PWD/android-sdk-linux
  - export PATH=$PATH:$PWD/android-sdk-linux/platform-tools/
  - echo y | $ANDROID_HOME/tools/bin/sdkmanager --update
  - echo y | $ANDROID_HOME/tools/bin/sdkmanager 'tools'
  - echo y | $ANDROID_HOME/tools/bin/sdkmanager 'platform-tools'
  - echo y | $ANDROID_HOME/tools/bin/sdkmanager 'build-tools;'$ANDROID_BUILD_TOOLS
  - echo y | $ANDROID_HOME/tools/bin/sdkmanager 'platforms;android-'$ANDROID_COMPILE_SDK
  - echo y | $ANDROID_HOME/tools/bin/sdkmanager 'extras;android;m2repository'
  - echo y | $ANDROID_HOME/tools/bin/sdkmanager 'extras;google;google_play_services'
  - echo y | $ANDROID_HOME/tools/bin/sdkmanager 'extras;google;m2repository'
  - chmod +x ./gradlew

stages:
  - build
  - test

build:
  stage: build
  script:
    - ./gradlew assembleDebug
  artifacts:
    paths:
    - app/build/outputs/
    
unitTests:
  stage: test
  script:
    - ./gradlew test