cmd: drop "bootc is experimental"

This is a left over that we should no longer be showing. Both PRs have
been merged and it's especially confusing now that we're publically
stating our timelines and asking users to migrate.

Signed-off-by: Simon de Vlieger <cmdr@supakeen.com>

Author: supakeen

cmd/image-builder/main.go

@@ -270,12 +270,6 @@ func cmdManifestWrapper(pbar progress.ProgressBar, cmd *cobra.Command, args []st
 	if err != nil {
 		return nil, err
 	}
-	// XXX: remove once https://github.com/osbuild/images/pull/1797
-	// and https://github.com/osbuild/bootc-image-builder/pull/1014
-	// are merged
-	if bootcRef != "" {
-		fmt.Fprintln(os.Stderr, "WARNING: bootc support is experimental")
-	}
 
 	// no error check here as this is (deliberately) not defined on
 	// "manifest" (if "images" learn to set the output filename in

doc/01-usage.md

@@ -198,7 +198,6 @@ When this happens you'll be presented with an error:
 
 ```console
 $ sudo image-builder build --bootc-ref quay.io/fedora/fedora-bootc:rawhide qcow2
-WARNING: bootc support is experimental
 [|] Manifest generation step
 Message: Building manifest for bootc-based-qcow2
 error: no default fs set: mount "/boot" requires a filesystem but none set