feat: configure build cache location for buildah
Allow configuration of the build cache location for buildah the same as for kaniko. Replaces $KANIKO_SNAPSHOT_IMAGE_CACHE with $DOCKER_BUILD_CACHE_LOCATION
BREAKING CHANGE: replaces kaniko-snapshot-image-cache with build-cache-location
Signed-off-by: Weimann, Simon simon.weimann@ruv.de
Closes #133 (closed)