Update build_images.py

Author: dclong

build_images.py

@@ -25,6 +25,9 @@
     "blog": [
         "https://github.com/legendu-net/docker-gitpod.git",
     ],
+    "rust_nightly": [
+        "https://github.com/legendu-net/docker-rust-utils.git",
+    ]
 }
 builder = DockerImageBuilder(branch_urls)
 builder.build_images(remove=True)