renovate.json

{
  "customManagers": [
    {
      "customType": "regex",
      "fileMatch": ["^plug\\.gd$"],
      "matchStrings": [
        "\\s+plug\\(\\s*\"(?<depName>.*)\",\\s+{\\s*\"commit\":\\s*\"(?<currentDigest>.*)\",\\s*\"renovate-branch\":\\s*\"(?<currentValue>.*)\""
      ],
      "packageNameTemplate": "https://github.com/{{{depName}}}.git",
      "versioningTemplate": "git",
      "datasourceTemplate": "git-refs"
    },
    {
      "customType": "regex",
      "fileMatch": ["^plug\\.gd$"],
      "matchStrings": [
        "\\s+plug\\(\"(?<depName>.*?)\",\\ \\{\\s*\"tag\":\\ \"(?<currentValue>.*)\""
      ],
      "packageNameTemplate": "https://github.com/{{{depName}}}.git",
      "versioningTemplate": "git",
      "datasourceTemplate": "git-tags"
    },
    {
      "customType": "regex",
      "fileMatch": ["^.env$"],
      "matchStrings": ["GODOT_VERSION=(?<currentValue>.*?)\\n"],
      "depNameTemplate": "godotengine/godot",
      "packageNameTemplate": "https://github.com/godotengine/godot.git",
      "versioningTemplate": "loose",
      "extractVersionTemplate": "^(?<version>.*)$",
      "datasourceTemplate": "git-tags"
    }
  ]
}