A new "shareCode" field is generated for each entry, and allows
unlogged users to access the entry through the /shared endpoint.
This feature is particularly useful to share articles from miniflux
to third-party users without having them to visit the original source.
The image proxy is disabled and special cache headers are proposed in
the shared page to avoid denial of service.
This adds the oauth2 provider `oidc`. It needs an additional argument, the OIDC discovery endpoint to figure out where the auth and token URLs are.
Configuration is similar to setting up the Google Authentication with these changes:
* `OAUTH2_PROVIDER = oidc`
* `OAUTH2_OIDC_DISCOVERY_ENDPOINT = https://auth.exampe.org/discovery`
