try Drone CI

.drone.yml

@@ -0,0 +1,15 @@
+---
+kind: pipeline
+type: docker
+
+platform:
+    arch: amd64
+    os: linux
+
+steps:
+    - name:
+      image: xmartlabs/jenkins-android
+      commands:
+          - ./gradlew assembleDebug
+      when:
+          - push

.gitlab-ci.yml

@@ -1,18 +0,0 @@
-image: openjdk:8-jdk
-
-variables:
-  GRADLE_VERSION: "3.3"
-
-before_script:
-  - ${GRADLE_HOME}/bin/gradle wrapper --gradle-version ${GRADLE_VERSION} -Dcom.android.build.gradle.overrideVersionCheck=true
-
-stages:
-  - build
-
-build:
-  stage: build
-  script:
-    - ./gradlew assembleDebug
-  artifacts:
-    paths:
-    - app/build/outputs/