Skip the real fetch test where buildah is not installed: every step is guarded by it

modules/mesh-build-image/cmd/mesh-build-image/integration_test.go

@@ -59,7 +59,7 @@ func realModule(t *testing.T) (*Module, *keptStates) {
 // The fetch step on a real repository: the workspace holds the commit's tree, with the Dockerfile in it, and a base
 // makes the merge preview.
 func TestFetchOnARealRepository(t *testing.T) {
-	needTools(t, "the fetch step on a real repository", "git")
+	needTools(t, "the fetch step on a real repository (every step is guarded by buildah and a user namespace)", "git", "buildah", "newuidmap")
 	m, states := realModule(t)
 	root := t.TempDir()
 	bare, work := filepath.Join(root, "forge", "novox", "demo.git"), filepath.Join(root, "work")