Update collection-index.yml (devcontainers#485)

Add new collection which contain feature for wolfi docker base images

Author: davzucky

_data/collection-index.yml

@@ -952,3 +952,8 @@
   contact: https://github.com/rhiroe/features/issues
   repository: https://github.com/rhiroe/features
   ociReference: ghcr.io/rhiroe/features
+- name: devcontainer features for wolfi base docker image
+  maintainer: David Zucker
+  contact: https://github.com/davzucky/devcontainers-features-wolfi/issues
+  repository: https://github.com/davzucky/devcontainers-features-wolfi
+  ociReference: ghcr.io/davzucky/devcontainers-features-wolfi