Document restrictions on transport in FROM
When using remote podman client, not all transports work as expected. So
document this limitation.
Fixes: containers/podman#15141
@@ -297,6 +297,12 @@ environment variable. `export BUILDAH_FORMAT=docker`
Overrides the first `FROM` instruction within the Containerfile. If there are multiple
FROM instructions in a Containerfile, only the first is changed.
+With the remote podman client, not all container transports will work as
+expected. For example, oci-archive:/x.tar will reference /x.tar on the remote
+machine instead of on the client. If you need to support remote podman clients,
+it is best to restrict yourself to containers-storage: and docker://
+transports.
+
#### **--help**, **-h**
Print usage statement
