templateSclink.yaml

captainVersion: '4'
documentation: Read the documentation @ https://shlink.io/documentation/
description: shlink is a URL shortener which provides both REST and CLI interfaces
  to interact with it.
services:
  "$$cap_appname":
    image: shlinkio/shlink:$$cap_shlink_version
    containerHttpPort: '8080'
    volumes:
      - "$$cap_appname-config:/etc/shlink/config/params"
    restart: always
caproverOneClickApp:
  variables:
    - id: "$$cap_shlink_version"
      label: shlink version tag
      description: Checkout their docker page for the valid tags @ https://hub.docker.com/r/shlinkio/shlink/tags
      defaultValue: 2.0.5
  instructions:
    start: shlink is a self-hosted url shortener server with a web interface.
    end: shlink is deployed and available as $$cap_appname.
  displayName: 'Shlink'

I think I got it working in app.shlink.to, would be nice to add this too in caprover.