Configure client secret securely from environment variable or file

[vitSkalicky]

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Feature request

Which Nextcloud Version are you currently using: 32.0.3

Is your feature request related to a problem? Please describe.
It is not possible to configure the OIDC client secret without exposing it to all users of the system. (program arguments are exposed in plaintaxt to all other processes on Linux)

Describe the solution you'd like
Add option to read client secret from an environment variable or file.

Describe alternatives you've considered
--clientsecret-file=PATH_TO_FILE_WITH_CLIENTSECRET or --clientsecret-env=CLIENTSECRET_ENV_VARIABLE_NAME

[oleksandr-nc]

Hello. Thank you for raising this issue, we will consider a solution.

[julien-nc]

This has been done in #1324. It would be nice if you could try the PR.