Alpine package repository for pim17. See https://github.com/tarxvftech/pim17 for more details

If you are running alpine already:
echo "https://alpine.tarxvf.tech/edge/" >> /etc/apk/repositories

You can also download raspberry pi images customized for hotspot and repeater use (<200MB each):
pim17 aarch64 (pi3 and better)
pim17 armhf (pi0w, pi2, and maybe pi1 but that would be very slow)