renovate.json

{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "extends": [
    "config:recommended"
  ],
  "customManagers": [
    {
      "fileMatch": ["^Dockerfile$"],
      "matchStrings": ["ARG RESTIC_VERSION=(?<currentValue>.*)"],
      "datasourceTemplate": "github-releases",
      "depNameTemplate": "restic/restic",
      "versioningTemplate": "semver",
      "extractVersionTemplate": "^v(?<version>.*)$",
      "currentValueTemplate": "{{ currentValue }}"
    },
    {
      "fileMatch": ["^Dockerfile$"],
      "matchStrings": ["ARG RCLONE_VERSION=(?<currentValue>.*)"],
      "datasourceTemplate": "github-releases",
      "depNameTemplate": "rclone/rclone",
      "versioningTemplate": "semver",
      "extractVersionTemplate": "^v(?<version>.*)$",
      "currentValueTemplate": "{{ currentValue }}"
    }
  ]
}