Include and enable Hocuspocus (Collaboration Server) (#135)

* include hocuspocus and respective configuration

* include defaults to hocuspocus setup

* Update release version

Co-authored-by: Kabiru Mwenja <makabby@gmail.com>

* update readme with explicit info about secret & localhost

---------

Co-authored-by: Kabiru Mwenja <makabby@gmail.com>

docker-compose.yml

@@ -19,6 +19,8 @@ x-op-app: &app
     RAILS_CACHE_STORE: "memcache"
     OPENPROJECT_CACHE__MEMCACHE__SERVER: "cache:11211"
     OPENPROJECT_RAILS__RELATIVE__URL__ROOT: "${OPENPROJECT_RAILS__RELATIVE__URL__ROOT:-}"
+    OPENPROJECT_COLLABORATIVE__EDITING__HOCUSPOCUS__URL: "${COLLABORATIVE_SERVER_URL:-wss://${OPENPROJECT_HOST__NAME}/hocuspocus}"
+    OPENPROJECT_COLLABORATIVE__EDITING__HOCUSPOCUS__SECRET: "${COLLABORATIVE_SERVER_SECRET:-OVERRIDE_ME_PLEASE}"
     DATABASE_URL: "${DATABASE_URL:-postgres://postgres:p4ssw0rd@db/openproject?pool=20&encoding=unicode&reconnect=true}"
     RAILS_MIN_THREADS: ${RAILS_MIN_THREADS:-4}
     RAILS_MAX_THREADS: ${RAILS_MAX_THREADS:-16}
@@ -63,6 +65,7 @@ services:
   web:
     <<: *app
     command: "./docker/prod/web"
+    hostname: "${OPENPROJECT_HOST__NAME:-localhost:8080}"
     networks:
       - frontend
       - backend
@@ -114,3 +117,12 @@ services:
     restart: on-failure
     networks:
       - backend
+
+  hocuspocus:
+    image: openproject/hocuspocus:release-38128805
+    environment:
+      SECRET: ${COLLABORATIVE_SERVER_SECRET:-OVERRIDE_ME_PLEASE}
+    networks:
+      - backend
+      - frontend
+    <<: *restart_policy