Update collection-index.yml (devcontainers#350)

Author: marcosgomesneto

_data/collection-index.yml

@@ -673,3 +673,8 @@
   contact: https://github.com/nikobockerman
   repository: https://github.com/nikobockerman/devcontainer-features
   ociReference: ghcr.io/nikobockerman/devcontainer-features
+- name: Bun.sh Runtime Dev Container Templates
+  maintainer: Marcos Gomes Neto
+  contact: https://github.com/marcosgomesneto/bun-devcontainers/issues
+  repository: https://github.com/marcosgomesneto/bun-devcontainers
+  ociReference: ghcr.io/marcosgomesneto/bun-devcontainers