Debugging and error reporting
Rebuild CLI logging is controlled by environment variables RBLD_LOG_LEVEL and RBLD_LOG_FILE.
Variable RBLD_LOG_LEVEL controls log verbosity, possible values are info, warn, error and fatal.
By default logging is disabled.
Variable RBLD_LOG_FILE defines name of file for logs to be sent to.
By default logs are printed to STDOUT.
Environment bootstrap tracing is controled by environment variable RBLD_BOOTSTRAP_TRACE.
Setting this variable to 1 enables environment startup tracing for rbld run and rbld modify.
By default tracing is disabled.
