make hocuspocus work out of the box (#140)

.env.example

@@ -17,5 +17,6 @@ RAILS_MIN_THREADS=4
 RAILS_MAX_THREADS=16
 PGDATA="/var/lib/postgresql/data"
 OPDATA="/var/openproject/assets"
+# URL the browser uses to connect to hocuspocus
 COLLABORATIVE_SERVER_URL=ws://localhost:8080/hocuspocus
 COLLABORATIVE_SERVER_SECRET=secret12345

docker-compose.yml

@@ -122,6 +122,8 @@ services:
     image: openproject/hocuspocus:release-38128805
     environment:
       SECRET: ${COLLABORATIVE_SERVER_SECRET:-OVERRIDE_ME_PLEASE}
+      OPENPROJECT_DIRECT_URL: "${OPENPROJECT_URL:-http://web}"
+      OPENPROJECT_HOST: "${OPENPROJECT_HOST__NAME:-localhost:8080}"
     networks:
       - backend
       - frontend