Dockerfile: Update to build against 11.x.

Future changes in this Dockerfile will depend on not-yet-released Zulip changes.

Author: alexmv

Dockerfile

@@ -28,7 +28,7 @@ WORKDIR /home/zulip
 # You can specify these in docker-compose.yml or with
 #   docker build --build-arg "ZULIP_GIT_REF=git_branch_name" .
 ARG ZULIP_GIT_URL=https://github.com/zulip/zulip.git
-ARG ZULIP_GIT_REF=11.4
+ARG ZULIP_GIT_REF=11.x
 
 RUN git clone "$ZULIP_GIT_URL" -b "$ZULIP_GIT_REF"
 

compose.override.yaml

@@ -36,7 +36,7 @@ services:
         ##
         ##  docker compose build zulip
         ZULIP_GIT_URL: https://github.com/zulip/zulip.git
-        ZULIP_GIT_REF: "11.4"
+        ZULIP_GIT_REF: "11.x"
     environment:
       ## See https://github.com/zulip/docker-zulip#configuration for
       ## details on this section and how to discover the many