Github user maskit commented on the issue:
https://github.com/apache/trafficserver/issues/1425
`config_dir` is a read-only configuration. Some of configurations are not
configurable at runtime.
https://docs.trafficserver.apache.org/en/latest/admin-guide/files/records.config.en.html#proxy-config-config-dir
Because overriding takes place WHILE (not before) reading `records.config`,
changing `config_dir` with the environment variable is too late, though
`traffic_layout` shows the new value. Even if you specify the new location in
the config file, it wouldn't work due to the same reason, the file has already
been open.
I've never used `TS_ROOT`, but it might work.
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