Set UPAAS_PORT as well as PORT in docker-compose.yml (closes #230)

upaas reads UPAAS_PORT before PORT, so a UPAAS_PORT line in .env made it
listen on another port than the one the compose file's port mapping and
healthcheck use, and the container never became healthy. The compose file
now sets both to 8080, and its comment and the README's Docker Compose
section say that both are set.

Model: opus-5-5

TODO.md

@@ -20,6 +20,11 @@ regress.
 
 # Completed Steps
 
+- 2026-09-29: `docker-compose.yml` now sets `UPAAS_PORT` to 8080 as well as
+  `PORT`, since upaas reads `UPAAS_PORT` first and a `UPAAS_PORT` in `.env` made
+  it listen away from the port mapping and healthcheck; the README's Compose
+  section names both (#230).
+
 - 2026-09-29: The README Configuration table now lists every setting upaas
   reads, adding `UPAAS_MAINTENANCE_MODE`, `UPAAS_SESSION_SECRET` and
   `UPAAS_CORS_ORIGINS`, and gives the real default and effect of each: