- incorporate gating test fixes from Ed Santiago:
- remove buildah and skopeo (unused)
- bump BATS from v1.1 to v1.5
- rename "nonroot" to "rootless"
- Related: #2000051
Signed-off-by: Ed Santiago <santiago@redhat.com>
Signed-off-by: Jindrich Novy <jnovy@redhat.com>