[openSUSE/obs-build] f64b65: Fix wiping build root for --vm-type podman (#954)

Branch: refs/heads/master Home: https://github.com/openSUSE/obs-build Commit: f64b65d19779a84dac4d8c5dab5c1e5640853b98 https://github.com/openSUSE/obs-build/commit/f64b65d19779a84dac4d8c5dab5c1e5... Author: Daniel Mach Date: 2023-10-04 (Wed, 04 Oct 2023) Changed paths: M build M build-vm-podman Log Message: ----------- Fix wiping build root for --vm-type podman (#954) * Refactor unmounting mounts under build root to unmount_build_root() * Improve mount detection under the build root by adding a space prefix Values in /proc/mounts are separated with a space. Prepending the space to the searched pattern should reduce number of wrong matches * podman: wipe remaining files from the build root