Add config file template for documentMaxLength setting

compose.yml

@@ -40,6 +40,9 @@ services:
       - source: entrypoint_conf
         target: /docker-entrypoint.sh
         mode: 0555
+      - source: config_json
+        target: /files/config.json
+        mode: 0700
     deploy:
       restart_policy:
         condition: on-failure
@@ -90,6 +93,10 @@ networks:
     external: true
   internal:
 configs:
+  config_json:
+    name: ${STACK_NAME}_config_${ENTRYPOINT_CONF_VERSION}
+    file: config.json.tmpl
+    template_driver: golang
   entrypoint_conf:
     name: ${STACK_NAME}_entrypoint_${ENTRYPOINT_CONF_VERSION}
     file: entrypoint.sh.tmpl