fix yq syntax

CHANGELOG.md

@@ -1,2 +1,2 @@
-- ENHANCEMENT
-  - Update dependency mikefarah/yq to v4
+- BUGFIX
+  - Fix `yq` syntax after upgrade to v4

overlay/usr/bin/lhci

@@ -7,10 +7,10 @@ exec 5>&1
 OUT=$(/usr/local/bin/lhci "$@" | tee /dev/fd/5) || ERROR=true
 
 if [ -f "$CONFIG" ] && echo "$OUT" | grep -q "Done running Lighthouse"; then
-    UPLOAD_TARGET=$(yq r "${CONFIG}" --defaultValue "" ci.upload.target)
-    UPLOAD_OUTPUT_DIR=$(yq r "${CONFIG}" --defaultValue "" ci.upload.outputDir)
+    UPLOAD_TARGET=$(yq e '.ci.upload.target' "${CONFIG}")
+    UPLOAD_OUTPUT_DIR=$(yq e '.ci.upload.outputDir' "${CONFIG}")
 
-    if [ "${UPLOAD_TARGET}" = "filesystem" ] && [ -n "${UPLOAD_OUTPUT_DIR}" ] ; then
+    if [ "${UPLOAD_TARGET}" = "filesystem" ] && [ "${UPLOAD_OUTPUT_DIR:-null}" != "null" ] ; then
         MANIFEST=${UPLOAD_OUTPUT_DIR%/}/manifest.json
         DIST="${LHCI_BASE_DIR%/}/${UPLOAD_OUTPUT_DIR%/}/dist"
         mkdir -p "${DIST}"