Ensure namespaced writer commit has correct namespace

The namespaced writer Commit method must always have a
namespace in the context as checked by the removeIngestLease
function, resulting in a panic when not provided.

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

metadata/content.go

@@ -567,6 +567,8 @@ func (nw *namespacedWriter) createAndCopy(ctx context.Context, desc ocispec.Desc
 }
 
 func (nw *namespacedWriter) Commit(ctx context.Context, size int64, expected digest.Digest, opts ...content.Opt) error {
+	ctx = namespaces.WithNamespace(ctx, nw.namespace)
+
 	nw.l.RLock()
 	defer nw.l.RUnlock()