As suggested in the docs I used travis setup releases generating the barebone configuration for pushing a release on github. However since it does not include the option skip_cleanup: true the file I wanted to be released was not found.
Generated code:
deploy:
provider: releases
api_key:
secure: blablakey
file: app/build/outputs/apk/debug/app-debug.apk
on:
repo: lprc/simple-dl
branch: travis
I think skip_cleanup: true should really be included since the use of it is explicitely suggested in the docs.