* add instructions and container to create a key and certificate pair
for the built-in IDM LDAP as we need it to listen on LDAPS for
Stalwart, which has been disabled by default with
https://github.com/opencloud-eu/opencloud/pull/2880
* add environment variables to point to the certificates
* update services/groupware/DEVELOPERS.md with up-to-date instructions,
using Stalwart 0.16
* re-implement the auth-api service to authenticate Reva tokens
following the OIDC Userinfo endpoint specification
* pass the context where necessary and add an authenticator interface
to the JMAP HTTP driver, in order to select between master
authentication (which is used when GROUPWARE_JMAP_MASTER_USERNAME and
GROUPWARE_JMAP_MASTER_PASSWORD are both set) and OIDC token
forwarding through bearer auth
* add Stalwart directory configuration "idmoidc" which uses the
OpenCloud auth-api service API (/auth/) to validate the token it
received as bearer auth from the Groupware backend's JMAP client,
using it as an OIDC Userinfo endpoint
* implement optional additional shared secret to secure the Userinfo
service, as an additional path parameter
* made a few changes in order to further simplify the setup for
developers of the Groupware backend
* add STALWART_DOMAIN to deployments/examples/opencloud_full/.env
* adapt the Stalwart configuration file to not set server.hostname and,
instead, pick it up from /etc/hostname, which is set by Docker
Compose as we can use default values for STALWART_DOMAIN there, in an
analogous fashion to the other containers in that project
* add config/keycloak/clients/groupware.json to avoid requiring manual
configuration of Keycloak via the admin web UI
* Stalwart container:
- listen for SMTPS on :1465
- remove the stalwart-logs volume, not needed (logs are going to
stdout)
* updated services/groupware/DEVELOPER.md:
- refer to a variable OCDIR to make instructions more copy-pasteable
- remove manual Keycloak configuration section as it is now obsolete,
replaced by provisioning a configuration file instead
