Add .gitlab-ci.yml

.gitlab-ci.yml

+image: openjdk:8-jdk
+
+variables:
+  ANDROID_COMPILE_SDK: "25"
+  ANDROID_BUILD_TOOLS: "23.0.2"
+  ANDROID_SDK_TOOLS: "24.4.1"
+
+before_script:
+  - apt-get --quiet update --yes
+  - apt-get --quiet install --yes wget tar unzip lib32stdc++6 lib32z1
+  - wget --quiet --output-document=android-sdk.tgz https://dl.google.com/android/android-sdk_r${ANDROID_SDK_TOOLS}-linux.tgz
+  - tar --extract --gzip --file=android-sdk.tgz
+  - echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter android-${ANDROID_COMPILE_SDK}
+  - echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter platform-tools
+  - echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter build-tools-${ANDROID_BUILD_TOOLS}
+  - echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter extra-android-m2repository
+  - echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter extra-google-google_play_services
+  - echo y | android-sdk-linux/tools/android --silent update sdk --no-ui --all --filter extra-google-m2repository
+  - export ANDROID_HOME=$PWD/android-sdk-linux
+  - export PATH=$PATH:$PWD/android-sdk-linux/platform-tools/
+  - chmod +x ./gradlew
+
+stages:
+  - build
+  - test
+
+build:
+  stage: build
+  script:
+    - ./gradlew assembleDebug
+  artifacts:
+    paths:
+    - app/build/outputs/
+
+unitTests:
+  stage: test
+  script:
+    - ./gradlew test
+    
\ No newline at end of file