packages/terafoundation/lib/master.js
function determineWorkerENV(worker) {
        const options = {};

        if (worker.service_context) {
            const envConfig = JSON.parse(worker.service_context);
            _.assign(options, envConfig);
            options.__process_restart = true;
            options.service_context = worker.service_context;
        }

        return options;
    }
function determineWorkerENV(worker) {
        const options = {};

        if (worker.service_context) {
            const envConfig = JSON.parse(worker.service_context);
            _.assign(options, envConfig);
            options.__process_restart = true;
            options.service_context = worker.service_context;
        }

        return options;
    }
assignment is set at /lib/api/start_workers