Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -1,4 +1,24 @@
-image: jangrewe/gitlab-ci-android
+# Read more about this script on this blog post https://about.gitlab.com/2018/10/24/setting-up-gitlab-ci-for-android-projects/, by Jason Lenny
+# If you are interested in using Android with FastLane for publishing take a look at the Android-Fastlane template.
+
+image: openjdk:8-jdk
+
+variables:
+
+  # ANDROID_COMPILE_SDK is the version of Android you're compiling with.
+  # It should match compileSdkVersion.
+  ANDROID_COMPILE_SDK: "29"
+
+  # ANDROID_BUILD_TOOLS is the version of the Android build tools you are using.
+  # It should match buildToolsVersion.
+  ANDROID_BUILD_TOOLS: "29.0.3"
+
+  # It's what version of the command line tools we're going to download from the official site.
+  # Official Site-> https://developer.android.com/studio/index.html
+  # There, look down below at the cli tools only, sdk tools package is of format:
+  #        commandlinetools-os_type-ANDROID_SDK_TOOLS_latest.zip
+  # when the script was last modified for latest compileSdkVersion, it was which is written down below
+  ANDROID_SDK_TOOLS: "6514223"
 
 stages:
   - build