Get latest unifi-controller with Updatecli

unifi.yaml

name: Get latest unifi controller version
sources:
  unifi:
    name: Get latest unifi version  
    kind: xml 
    spec:
      # Using the UniFi Network Application RSS
      file: https://community.ui.com/rss/releases/UniFi%20Network%20Application/e6712595-81bb-4829-8e42-9e2630fabcfe
      path: "/rss/channel/item[1]/title"
    transformers:
      - findsubmatch:
          pattern: "([0-9]+\\.[0-9]+\\.[0-9]+)"
          captureindex: 1

targets:
  dockerfile:
    name: 'deps: bump unifi-controller version to {{ source "unifi"}}'
    kind: dockerfile
    spec:
      file: Dockerfile
      instruction:
        keyword: ARG 
        matcher: "UNIFI_CONTROLLER_VERSION"