Bump version from v2.1.4 to v2.1.5

Fixed maintainer label (deprecated).

Dockerfile

 FROM ruby:2.5.3
-MAINTAINER web-services-core <web-services-core@cern.ch>
+LABEL maintainer="web-services-core <web-services-core@cern.ch>"
 
 ### Install prerequisites #############################
 RUN apt update && \
@@ -29,7 +29,7 @@ RUN apt update && \
 
 ### Set up Discourse ##################################
 #   - So we can overrride it with --build_arg
-ARG DISCOURSE_VERS='v2.1.4'
+ARG DISCOURSE_VERS='v2.1.5'
 ENV DISCOURSE_RELEASE=$DISCOURSE_VERS RAILS_ENV=production RAILS_ROOT=/discourse HOME=/discourse
 
 RUN mkdir -p discourse && \

templates/discourse-cern.yaml

@@ -512,7 +512,7 @@ objects:
   data:
     discourse.conf: |2
       # connection pool size, sidekiq is set to 1, allowing an extra 3 for bg threads
-      db_pool = 4
+      db_pool = 2
 
       # database timeout in milliseconds
       db_timeout = 5000