test gitlab concurrency

.gitlab-ci.yml

+variables:
+  - DBNAME: "bokeh_build_${CI_BUILD_ID}"
+  - DBUSER: root
+  - DBPASS: root
+
 test:
   script:
-  - DBNAME="bokeh_build_$CI_BUILD_ID"
-  - DBUSER="root"
-  - DBPASS="root"
   - wget http://sandbox.pergame.net/databases/default-ci-dump.sql.gz -O default-ci-dump.sql.gz
-  - mysql -u$DBUSER -p$DBPASS -e "drop schema if exists $DBNAME; create schema $DBNAME"
-  - zcat default-ci-dump.sql.gz | mysql -u$DBUSER -p$DBPASS $DBNAME
-  - mysql -u$DBUSER -p$DBPASS -e "drop trigger if exists $DBNAME.datemaj_notices_update;update
-    mysql.proc set definer='$DBUSER@localhost' where db='$DBNAME'"
+  - mysql -u $DBUSER -p $DBPASS -e "drop schema if exists ${DBNAME}; create schema ${DBNAME}"
+  - zcat default-ci-dump.sql.gz | mysql -u $DBUSER -p $DBPASS $DBNAME
+  - mysql -u $DBUSER -p $DBPASS -e "drop trigger if exists ${DBNAME}.datemaj_notices_update;update
+    mysql.proc set definer='${DBUSER}@localhost' where db='${DBNAME}'"
   - source build.sh $DBNAME $DBUSER $DBPASS
-  - mysql -u$DBUSER -p$DBPASS -e "drop schema if exists $DBNAME"
+  - mysql -u $DBUSER -p $DBPASS -e "drop schema if exists $DBNAME"