Proguard file missing

[i906]

Hi, I am using your Docker image in my Gitlab CI.

The Gradle build failed when I enabled Proguard for a specific build.

I am using Gradle 2.14.1 and Android Gradle 2.1.3.

Below are the relevant logs:

gitlab-ci-multi-runner 1.1.4 (9e2fd1a)
Using Docker executor with image iflix/android ...
Pulling docker image iflix/android ...

Running on runner-34dfd59e-project-23-concurrent-0 via 955e341e690f...
Fetching changes...
Removing .gradle/
Removing app/build/
HEAD is now at 4b5bf9c Merge branch 'hotfix/2.2.3-2'
Checking out 4b5bf9c6 as 2.2.3-2...
HEAD is now at 4b5bf9c... Merge branch 'hotfix/2.2.3-2'

$ ./gradlew assembleRelease
Jack is required to support java 8 language features.
Incremental java compilation is an incubating feature.

...

:app:transformClassesAndResourcesWithProguardForCentralRelease
Warning: Exception while processing task java.io.FileNotFoundException: /usr/local/android-sdk/tools/proguard/proguard-android.txt (No such file or directory)
:app:transformClassesAndResourcesWithProguardForCentralRelease FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:transformClassesAndResourcesWithProguardForCentralRelease'.
> java.io.FileNotFoundException: /usr/local/android-sdk/tools/proguard/proguard-android.txt (No such file or directory)

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 15.159 secs

ERROR: Build failed: exit code 1

Thanks for your Docker image frequent updates.