kpartx moved to usr/sbin in alpine edge

Since this is my first pull request for postmarketos,i have a question about testing this.

Is there an easy way to let pmaports (change the APKBUILD or other means) use my git repo branch. Or can I do a command so i can use my git repo as sources for the build of a local package so I can test the build via pmbootstrap install --android-recovery-zip Before merging this, making a new release and updating the APKBUILD in pmaports?