[Feature] Add support for Custom CA Certificate for OIDC

[CygnusHyoga]

Is your feature request related to a problem? Please describe.

With the new OIDC integration functionality, I have tried to configure my previously existing Authentik instance to authenticate to RoMM, without success since this instance uses self-generated certificates.

It would be nice to add support for self-generated CA certificates for OIDC integration that are configured over SSL.

Describe the solution you'd like

Add support for OS CA certificates mounted by default in /etc/ssl/certs/ca-certificates.crt

These certificates could be mounted by the user in the OS without the need to specify a specific variable for this purpose.

Describe alternatives you've considered

• Add an environment variable specifying the location of fileca-certificates.crt or the directory with certificates.

• Add an environment variable with the option to skip certificate validation, for example: skipTLSVerify: true

Additional context

[gantoine]

https://discord.com/channels/1138838206532554853/1326543333358833665