Output: 
> Task :app:reportReleaseComposeMappingErrors
Caching disabled for task ':app:reportReleaseComposeMappingErrors' because:
  Logs warnings reported by worker from the previous task
Task ':app:reportReleaseComposeMappingErrors' is not up-to-date because:
  Task has not declared any outputs despite executing actions.

> Task :app:minifyReleaseWithR8
file or directory '/home/Messier82/projects/service-book/app/src/main/keepRules', not found
file or directory '/home/Messier82/projects/service-book/app/src/release/keepRules', not found
Build cache key for task ':app:minifyReleaseWithR8' is 7976a34a8d9451fecbe736e18e6cfac3
Task ':app:minifyReleaseWithR8' is not up-to-date because:
  Executed with '--rerun-tasks'.
R8 is a new Android code shrinker. If you experience any issues, please file a bug at
https://issuetracker.google.com, using 'Shrinker (R8)' as component name.
Current version is: 9.2.14.

file or directory '/home/Messier82/projects/service-book/app/build/intermediates/generated_proguard_file/release/mergeReleaseGeneratedProguardFiles/proguard.txt', not found
file or directory '/home/Messier82/projects/service-book/app/src/main/keepRules', not found
file or directory '/home/Messier82/projects/service-book/app/src/release/keepRules', not found
Process Group PGID: 289194