Don't use testing repo for stable branches in aports CI
When building for stable branches, the testing repository is added to /etc/apk/repositories
, resulting in apk reporting errors at the end of the build.
At 17.00 UTC, gitlab will be upgraded and briefly unavailable.
When building for stable branches, the testing repository is added to /etc/apk/repositories
, resulting in apk reporting errors at the end of the build.