@okias Neat! As a service to your pmOS readers. Downloading an apk from a merge request can be even simpler:
apk add mrtest
mrtest add -a 55520
The first command installs mrtest, if you don't already have it. The second one downloads and installs the apk from the merge request (the "-a" is for downloading an alpine MR instead of a pmOS MR).
Source: https://wiki.postmarketos.org/wiki/Mrtest
@fraolt I didn't knew it supported the Alpine MRs too! Updated the article. Thank you.