Change flavor for staging to m1.large

.gitlab-ci.yml

@@ -37,7 +37,7 @@ prep-deploy:
            openstack volume create --snapshot xdmod-dev-volume-snap --size 20 $TF_VAR_data_volume
       elif [ "$TARGET_ENV" = "staging" ]; then
            TF_VAR_data_volume="xdmod-staging-volume-$BUILD_DATE"
-           TF_VAR_flavor="m1.medium"
+           TF_VAR_flavor="m1.large"
            openstack volume create --snapshot xdmod-staging-volume-snap --size 150 $TF_VAR_data_volume
       elif [ "$TARGET_ENV" = "production" ]; then
            TF_VAR_data_volume="xdmod-staging-volume"