Motiejus Jakštys bafb6791d3 oidc: allow reading the client secret from a file
Currently the most "secret" way to specify the oidc client secret is via
an environment variable `OIDC_CLIENT_SECRET`, which is problematic[1].
Lets allow reading oidc client secret from a file. For extra convenience
the path to the secret will resolve the environment variables.

[1]: https://systemd.io/CREDENTIALS/
2023-01-14 17:03:57 +01:00
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