message: Update variant schema for environment variables
diff: "default": "static",
  "description": "Sets the value of BUILD_SHARED on the CMake command line"
  },
  + "env": {
  + "type": "object",
  + "description": "Environment variables to set during CMake configuration",
  + "additionalProperties": false,
  + "patternProperties": {
  + "^\\w+$": {
  + "type": "string",
  + "description": "Value for the environment variable"
  + }
  + }
  + },
  "settings": {
  "type": "object",
  "description": "The -D arguments to pass to CMake for this variant",
  