Refactor groupware service after ADR decision on the Groupware API

* after having decided that the Groupware API should be a standalone
   independent custom REST API that is using JMAP data models as much as
   possible,
 * removed Groupware APIs from the Graph service
 * moved Groupware implementation to the Groupware service, and
   refactored a few things accordingly

devtools/deployments/opencloud_full/config/stalwart/config.toml

@@ -39,11 +39,11 @@ metrics.prometheus.auth.secret = "secret"
 metrics.prometheus.auth.username = "metrics"
 metrics.prometheus.enable = true
 server.hostname = "stalwart.opencloud.test"
-server.http.allowed-endpoint = 200
-server.http.hsts = false
-server.http.permissive-cors = false
-server.http.url = "'https://stalwart.opencloud.test:' + local_port"
-server.http.use-x-forwarded = false
+http.allowed-endpoint = 200
+http.hsts = true
+http.permissive-cors = false
+http.url = "'https://' + config_get('server.hostname')"
+http.use-x-forwarded = true
 server.listener.http.bind = "[::]:8080"
 server.listener.http.protocol = "http"
 server.listener.https.bind = "[::]:443"

devtools/deployments/opencloud_full/stalwart.yml

@@ -14,6 +14,7 @@ services:
       - "127.0.0.1:143:143"
       - "127.0.0.1:993:993"
     volumes:
+      - /etc/localtime:/etc/localtime:ro
       - ./config/stalwart:/opt/stalwart/etc
       - stalwart-data:/opt/stalwart/data
       - stalwart-logs:/opt/stalwart/logs