zipline: CORE_DATABASE_URL -> DATABASE_URL (v4 dropped the prefix for the DB var)

zipline crash-looped 15 times on a fresh deploy:

  ERROR config::readDbVars] No database environment variables found
  (DATABASE_URL or all of [DATABASE_USERNAME, DATABASE_PASSWORD,
  DATABASE_HOST, DATABASE_PORT, DATABASE_NAME]), exiting...

In Zipline v4 the database variable is DATABASE_URL with NO prefix, while
CORE_SECRET kept its prefix (confirmed against the upstream config docs) -- so
only the DB variable was renamed here.

The template was already pinned to the v4 line (4.0.0) before this campaign, and
v4 has always required DATABASE_URL, so zipline has been undeployable from the
catalog for the whole v4 series. PRE-EXISTING defect, surfaced by the sweep.

Campaign 7 catalog sweep.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Nn3VgQk9iwEGgyx6QJ2NvE

templates/zipline/docker-compose.yml

@@ -19,7 +19,11 @@ services:
     environment:
       - TZ=Europe/Budapest
       - CORE_SECRET=${CORE_SECRET}
-      - CORE_DATABASE_URL=postgresql://zipline:${DB_PASSWORD}@zipline-postgres:5432/zipline
+      # FIGYELEM: a v4 óta a DB változó neve DATABASE_URL (prefix NÉLKÜL), míg a
+      # CORE_SECRET megtartotta a prefixet. A régi CORE_DATABASE_URL nevet a v4
+      # már nem ismeri fel, és indulás nélkül kilép:
+      #   "No database environment variables found (DATABASE_URL or all of [...])"
+      - DATABASE_URL=postgresql://zipline:${DB_PASSWORD}@zipline-postgres:5432/zipline
     volumes:
       - zipline_uploads:/zipline/uploads
       - zipline_public:/zipline/public