Use electron_custom_version set by npm_config or npm_package_config

It would be nice if the electron_custom_version option

get/src/index.ts

Line 81 in 607f621

process.env.ELECTRON_CUSTOM_VERSION || artifactDetails.version,

would also be searched for in the env vars set by the npm_config or npm_package_config similar to the other env var options

get/src/artifact-utils.ts

Lines 36 to 41 in 607f621

	process.env[`NPM_CONFIG_ELECTRON_${lowerName.toUpperCase()}`] ||
	process.env[`npm_config_electron_${lowerName}`] ||
	process.env[`npm_package_config_electron_${lowerName}`] ||
	process.env[`ELECTRON_${lowerName.toUpperCase()}`] ||
	options[name] ||
	defaultValue