add bootc transports to os-apply

now that we use `bootc switch` for changing out-of-band updates, we can
consider also using some of their supported transports.

* containers-storage
* oci
* oci-archive
* registry

RUN-3963
Signed-off-by: Brent Baude <bbaude@redhat.com>

cmd/podman/machine/os/apply.go

@@ -12,14 +12,18 @@ import (
 )
 
 var applyCmd = &cobra.Command{
-	Use:               "apply [options] IMAGE [NAME]",
+	Use:               "apply [options] URI [NAME]",
 	Short:             "Apply an OCI image to a Podman Machine's OS",
 	Long:              "Apply custom layers from a containerized Fedora CoreOS OCI image on top of an existing VM",
 	PersistentPreRunE: validate.NoOp,
 	Args:              cobra.RangeArgs(1, 2),
 	RunE:              apply,
-	ValidArgsFunction: common.AutocompleteImages,
-	Example:           `podman machine os apply myimage`,
+	ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]cobra.Completion, cobra.ShellCompDirective) {
+		images, _ := common.AutocompleteImages(cmd, args, toComplete)
+		// We also accept an URI so ignore ShellCompDirectiveNoFileComp and use the default one instead to get file paths completed by the shell.
+		return images, cobra.ShellCompDirectiveDefault
+	},
+	Example: `podman machine os apply myimage`,
 }
 
 var restart bool