Full file

.gitlab-ci.yml

image: openjdk:8-jdk #Defining the Docker Image

variables:
  ANDROID_COMPILE_SDK: "28" #set compile SDK version
  ANDROID_BUILD_TOOLS: "28.0.2" #set build tool version
  ANDROID_SDK_TOOLS:   "4333796" #set SDK tool build number you can find yous here https://developer.android.com/studio/releases/sdk-tools

before_script:
     #Installing Packages
     - apt-get --quiet update --yes
     - apt-get --quiet install --yes wget tar unzip lib32stdc++6 lib32z1

     #Installing the Android SDK
     - wget --quiet --output-document=android-sdk.zip https://dl.google.com/android/repository/sdk-tools-linux-${ANDROID_SDK_TOOLS}.zip
     - unzip -d android-sdk-linux android-sdk.zip
     - echo y | android-sdk-linux/tools/bin/sdkmanager "platforms;android-${ANDROID_COMPILE_SDK}" >/dev/null
     - echo y | android-sdk-linux/tools/bin/sdkmanager "platform-tools" >/dev/null
     - echo y | android-sdk-linux/tools/bin/sdkmanager "build-tools;${ANDROID_BUILD_TOOLS}" >/dev/null

     #Setting up the environment variable
     - export ANDROID_HOME=$PWD/android-sdk-linux
     - export PATH=$PATH:$PWD/android-sdk-linux/platform-tools/
     - chmod +x ./gradlew #set executable permission

     # temporarily disable checking for EPIPE error and use yes to accept all licenses
     - set +o pipefail
     - yes | android-sdk-linux/tools/bin/sdkmanager --licenses # accept SDK licences
     - set -o pipefail
# - build_release_android
stages:
  - build_release_android

build_release_android:
  stage: build_release_android
  script:
    - mkdir /PlayJson #make temp directory named PlayJson in root of project
    - "echo $PLAY_STORE_JSON > /PlayJson/play-store-key.json" # copy git variable value to play-store-key.json file
    - ./gradlew publishApkRelease # command to publish app on play store
  only:
    - master #set trigger for CICD if push or merge in master branch
  artifacts:
    paths:
    - ./app/build/outputs/ # set artifact path which store your APK file