[FEAT] Read ACCOUNT_TOKEN from a file

[shizunge]

Is this a new feature request?

• [X] I have searched the existing issues

Wanted change

In additional to set ACCOUNT_TOKEN via environment, we need to read the token via a file. The file name can be set via environment ACCOUNT_TOKEN_FILE.

Reason for change

This allows us to pass the token via docker secrets.

Proposed code change

No response

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[Roxedus]

https://github.com/linuxserver/docker-foldingathome#environment-variables-from-files-docker-secrets

[shizunge]

Thanks!