fix: correct update script to support version argument again

functions.sh

@@ -137,12 +137,16 @@ function get_config() {
 #
 # The result is a list of valid versions.
 function get_versions() {
+  shift
+
   local versions=()
-  local dirs=()
+  local dirs=("$@")
 
   local default_variant
   default_variant=$(get_config "./" "default_variant")
-  IFS=' ' read -ra dirs <<< "$(echo "./"*/)"
+  if [ ${#dirs[@]} -eq 0 ]; then
+    IFS=' ' read -ra dirs <<< "$(echo "./"*/)"
+  fi
 
   for dir in "${dirs[@]}"; do
     if [ -a "${dir}/Dockerfile" ] || [ -a "${dir}/${default_variant}/Dockerfile" ]; then

update.sh

@@ -189,6 +189,8 @@ function update_node_version() {
   )
 }
 
+pids=()
+
 for version in "${versions[@]}"; do
   parentpath=$(dirname "${version}")
   versionnum=$(basename "${version}")
@@ -201,8 +203,6 @@ for version in "${versions[@]}"; do
   # See details in function.sh
   IFS=' ' read -ra variants <<< "$(get_variants "${parentpath}")"
 
-  pids=()
-
   if [ -f "${version}/Dockerfile" ]; then
     if [ "${update_version}" -eq 0 ]; then
       update_node_version "${baseuri}" "${versionnum}" "${parentpath}/Dockerfile.template" "${version}/Dockerfile" &