{community,testing}/*: add HARECACHE env var to hare aports
to make sure no old cache is used during build, like what we do for golang aports
We are currently working on getting Alpine Linux 3.21 out. This means that merge requests that are not aimed to help with that (only affecting testing, new aports) have a lower priority at the moment. Please be patient, they will be eventually picked up.
to make sure no old cache is used during build, like what we do for golang aports