Fix install path error

scripts/install

@@ -156,7 +156,7 @@ install_docker_compose() {
 install_umbrel() {
   version=$(get_umbrel_version)
   curl --location "https://api.github.com/repos/${UMBREL_REPO}/tarball/${version}" | \
-    tar --extract --gzip --strip-components=1 --directory="${INSTALL_PATH}"
+    tar --extract --gzip --strip-components=1 --directory="${UMBREL_INSTALL_PATH}"
 }
 
 main() {
@@ -174,10 +174,10 @@ main() {
 
   if [[ "${INSTALL_UMBREL}" = "true" ]]
   then
-    mkdir -p "${INSTALL_PATH}"
-    if [[ "$(ls --almost-all "${INSTALL_PATH}")" ]]
+    mkdir -p "${UMBREL_INSTALL_PATH}"
+    if [[ "$(ls --almost-all "${UMBREL_INSTALL_PATH}")" ]]
     then
-      echo "Error: Umbrel install path \"${INSTALL_PATH}\" already contains files"
+      echo "Error: Umbrel install path \"${UMBREL_INSTALL_PATH}\" already contains files"
       exit 1
     fi
   fi