Add gitlab ci configuration

image: "registry.gitlab.e.foundation:5000/e/apps/docker-android-apps-cicd:latest"

stages:

- build

before_script:

- export GRADLE_USER_HOME=$(pwd)/.gradle

- chmod +x ./gradlew

cache:

  key: ${CI_PROJECT_ID}

  paths:

  - .gradle/

build:

  stage: build

  script:

  - ./gradlew build

  artifacts:

    paths:

    - app/build/outputs/apk/

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