easy gitlab-ci with fdroid nightly support

Update .gitlab-ci
1 job for patch-1 in 25 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
failed build #3274

00:00:25

 
Name Stage Failure
failed
build Build
$ export GRADLE_USER_HOME=$PWD/.gradle
$ export ANDROID_COMPILE_SDK=`sed -n 's,.*compileSdkVersion\s*\([0-9][0-9]*\).*,\1,p' app/build.gradle`
$ echo y | sdkmanager "platforms;android-${ANDROID_COMPILE_SDK}" > /dev/null
$ gradle wrapper
/bin/bash: line 88: gradle: command not found
Running after script...
$ rm -f $GRADLE_USER_HOME/caches/modules-2/modules-2.lock
$ rm -fr $GRADLE_USER_HOME/caches/*/plugin-resolution/
ERROR: Job failed: exit code 1