Fixed the gpg key substituion

Author: LaurentGoderre

update.sh

@@ -121,7 +121,7 @@ function update_node_version() {
     for key_type in "node" "yarn"; do
       while read -r line; do
         pattern='"\$\{'$(echo "${key_type}" | tr '[:lower:]' '[:upper:]')'_KEYS\[@\]\}"'
-        sed -Ei -e "s/([ \\t]*)(${pattern})/\\1${line}${new_line}\\1\\2/" "${dockerfile}"
+        sed -Ei -e "s/([ \\t]*)(${pattern})/\\1${line}${new_line}\\1\\2/" "${dockerfile}-tmp"
       done <"keys/${key_type}.keys"
       sed -Ei -e "/${pattern}/d" "${dockerfile}-tmp"
     done