Run client-y tests with --frozen-lockfile

Seems to be best-practice and may be a little faster

scripts/common_startup.sh

@@ -19,6 +19,7 @@ REPLACE_PIP=$SET_VENV
 COPY_SAMPLE_FILES=1
 SKIP_CLIENT_BUILD=${GALAXY_SKIP_CLIENT_BUILD:-0}
 NODE_VERSION=${GALAXY_NODE_VERSION:-"$(cat client/.node_version)"}
+YARN_INSTALL_OPTS=${YARN_INSTALL_OPTS:-"--network-timeout 300000 --check-files"}
 
 for arg in "$@"; do
     [ "$arg" = "--skip-eggs" ] && FETCH_WHEELS=0
@@ -258,7 +259,7 @@ if [ $SKIP_CLIENT_BUILD -eq 0 ]; then
     fi
     # Build client
     cd client
-    if yarn install --network-timeout 300000 --check-files; then
+    if yarn install $YARN_INSTALL_OPTS; then
         if ! yarn run build-production-maps; then
             echo "ERROR: Galaxy client build failed. See ./client/README.md for more information, including how to get help."
             exit 1