fix: Fix commandline argument passing to runBlazegraph.sh

This commit fixes two issues in the container scripts that prevented
users from passing any options to blazegraph (as document here:
https://www.mediawiki.org/wiki/Wikidata_Query_Service/User_Manual#Configurable_properties)

This commit changes two things:
 - Rather than overwrite $BLAZEGRAPH_OPTS in entrypoint.sh, it extends
   it
 - It modified the root directoy runBlazegraph.sh to no longer drop all
   arguments passed to the docker command property

Docker/build/WDQS/entrypoint.sh

@@ -13,7 +13,7 @@ done
 
 set -eu
 
-export BLAZEGRAPH_OPTS="-DwikibaseHost=${WIKIBASE_HOST}"
+export BLAZEGRAPH_OPTS="${BLAZEGRAPH_OPTS} -DwikibaseHost=${WIKIBASE_HOST}"
 export UPDATER_OPTS="-DwikibaseHost=${WIKIBASE_HOST} -DwikibaseMaxDaysBack=${WIKIBASE_MAX_DAYS_BACK}"
 
 envsubst < /templates/mwservices.json > /wdqs/mwservices.json

Docker/build/WDQS/runBlazegraph.sh

@@ -2,5 +2,6 @@
 # This file is provided by the wikibase/wdqs docker image.
 
 cd /wdqs || exit
+shift
 
-./runBlazegraph.sh
+./runBlazegraph.sh "$@"