in src/common_tags.ts [3:15]
function add_non_empty(tags: Record<string, string>, tag: string, ...env_vars: string[]): void {
for (const env_var of env_vars) {
let value = process.env[env_var];
if (value == undefined) {
continue;
}
value = value.toString().trim();
if (value.length > 0) {
tags[tag] = value;
break;
}
}
}