Require DSPACE_UI_BASEURL in the deploy compose

7.6.7 stopped deriving `ui.baseUrl` from DSPACE_UI_HOST/PORT/SSL and hardcoded
`http://localhost:4000` instead, so those vars are now silently ignored for this
purpose. Legacy `/bitstream/handle/...` redirects and the robots.txt Sitemap would
point at localhost with no error in the log.

`docker/docker-compose.yml` now requires DSPACE_UI_BASEURL with no default, so a
deploy that forgets it fails loudly. It has to be added to each instance's env file
(deploy.yml passes `--env-file /opt/dspace-envs/...`). CI is unaffected -
docker-compose-ci.yml has no dspace-angular service.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: milanmajchrak

README-dtq.md

@@ -121,6 +121,17 @@ DSPACE_NAMESPACE # The namespace of the angular application
 DSPACE_SSL # Whether the angular application uses SSL [true/false]
 ```
 
+**Required since 7.6.7:**
+
+```bash
+DSPACE_UI_BASEURL # Public URL this UI answers on, e.g. https://lindat.example.org/repository
+```
+
+`ui.baseUrl` used to be derived from `DSPACE_HOST`/`DSPACE_PORT`/`DSPACE_SSL`; 7.6.7 replaced that with a
+hardcoded `http://localhost:4000` default. It is used for legacy `/bitstream/handle/...` redirects and for
+the `robots.txt` Sitemap, so leaving it at the default silently breaks historical citation URLs.
+`docker/docker-compose.yml` therefore requires it - the stack refuses to start if it is missing from `.env`.
+
 All other settings can be set using the following convention for naming the environment variables:
 
 1. replace all `.` with `_`

docker/docker-compose.yml

@@ -22,6 +22,11 @@ services:
       # Use only `4000`, not the {UI_PORT} from the .env because in the container it is always `4000`
       DSPACE_UI_PORT: 4000
       DSPACE_UI_NAMESPACE: ${DSPACE_UI_NAMESPACE:-/}
+      # Public URL this UI answers on. Since 7.6.7 `ui.baseUrl` is no longer derived from
+      # DSPACE_UI_HOST/PORT/SSL, so it MUST be set explicitly in `.env` - otherwise legacy
+      # /bitstream/handle/... redirects and robots.txt Sitemap point at localhost.
+      # Intentionally has no default: a missing value fails the stack instead of failing silently.
+      DSPACE_UI_BASEURL: ${DSPACE_UI_BASEURL:?set it in .env to the public UI URL, e.g. https://lindat.example.org/repository}
       DSPACE_REST_SSL: ${DSPACE_SSL:-false}
       DSPACE_REST_HOST: ${DSPACE_HOST:-localhost}
       DSPACE_REST_PORT: ${DSPACE_REST_PORT:-8080}