Buildkite: fix shellcheck on setup-db-archive-node

Author: dannywillems

buildkite/scripts/setup-database-for-archive-node.sh

@@ -12,5 +12,5 @@ sudo service postgresql start
 sudo -u postgres psql -c "CREATE USER ${user} WITH LOGIN SUPERUSER PASSWORD '${password}';"
 sudo pg_isready
 service postgresql status
-sudo -u postgres createdb -O $user $db
-PGPASSWORD=$password psql -h localhost -p $port -U $user -d $db -a -f src/app/archive/create_schema.sql
+sudo -u postgres createdb -O "${user}" "${db}"
+PGPASSWORD="${password}" psql -h localhost -p "${port}" -U "${user}" -d "${db}" -a -f src/app/archive/create_schema.sql