Update collection-index.yml

Author: siri404

_data/collection-index.yml

@@ -1082,3 +1082,8 @@
   contact: https://github.com/RyanLua/templates/issues
   repository: https://github.com/RyanLua/templates
   ociReference: ghcr.io/ryanlua/templates
+- name: siri404 Features
+  maintainer: siri404
+  contact: https://github.com/siri404/devcontainers/issues
+  repository: https://github.com/siri404/devcontainers
+  ociReference: ghcr.io/siri404/devcontainers