Add PostFinance devcontainer-features to collection-index (#682)

Author: mailaenderli

_data/collection-index.yml

@@ -1456,3 +1456,8 @@
   contact: https://github.com/wcgomes/devcontainer-features/issues
   repository: https://github.com/wcgomes/devcontainer-features
   ociReference: ghcr.io/wcgomes/devcontainer-features
+- name: PostFinance Features
+  maintainer: PostFinance AG
+  contact: https://github.com/postfinance/devcontainer-features/issues
+  repository: https://github.com/postfinance/devcontainer-features
+  ociReference: ghcr.io/postfinance/devcontainer-features