fix: include jpush handler in docker config

docker/tinode/Dockerfile

@@ -182,6 +182,18 @@ ENV TNPG_AUTH_TOKEN=
 # Tinode Push Gateway organization name as registered at console.tinode.co
 ENV TNPG_ORG=
 
+# Disable JPush by default. The handler can be enabled from HotGo sys_config
+# through the im_jpush dictionary group when the config stanza is present.
+ENV JPUSH_PUSH_ENABLED=false
+ENV JPUSH_API_DOMAIN=https://api.jpush.cn
+ENV JPUSH_PUSH_PATH=/v3/push
+ENV JPUSH_DEFAULT_TTL_SECONDS=86400
+ENV JPUSH_CALL_TTL_SECONDS=60
+ENV JPUSH_APNS_PRODUCTION=false
+ENV JPUSH_USE_ALIAS=false
+ENV JPUSH_CLASSIFICATION=1
+ENV JPUSH_TITLE=MeetingIM
+
 # Video calls configuration.
 ENV WEBRTC_ENABLED=false
 ENV ICE_SERVERS_FILE=/opt/tinode/ice-servers.json