Add OnBuild support for podman build

Only supported for docker formated images. OCI Does not support this flag.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

vendor/github.com/projectatomic/buildah/pkg/cli/common.go

@@ -152,6 +152,10 @@ var (
 			Name:  "squash",
 			Usage: "Squash newly built layers into a single new layer. Buildah does not currently support caching so this is a NOOP.",
 		},
+		cli.BoolTFlag{
+			Name:  "stream",
+			Usage: "There is no daemon in use, so this command is a NOOP.",
+		},
 		cli.StringSliceFlag{
 			Name:  "tag, t",
 			Usage: "tagged `name` to apply to the built image",