fix validate-chart scripts:

- clean-up temp yaml file
- fix k8s version check
- fix rke2-coredns templating

scripts/validate-charts

@@ -51,7 +51,7 @@ check_system_registry() {
     chart_tmp=$3
 
     yaml_tmp=$(mktemp --suffix .yaml)
-    values="global.systemDefaultRegistry=my-registry,global.cattle.systemDefaultRegistry=my-registry,vCenter.clusterId=test-id"
+    values="global.systemDefaultRegistry=my-registry,global.cattle.systemDefaultRegistry=my-registry,vCenter.clusterId=test-id,global.clusterDNS=10.43.0.10"
     helm template test-chart --kube-version ${KUBERNETES_VERSION} --set $values $chart_tmp > $yaml_tmp;
 
     awk '$1 ~ /^image:/ {
@@ -60,6 +60,9 @@ check_system_registry() {
         }
     }
     ' $yaml_tmp
+
+    #clean-up
+    rm -f $yaml_tmp
 }
 
 is_supported() {
@@ -110,7 +113,7 @@ check_airgap() {
     chart_tmp=$3
 
     yaml_tmp=$(mktemp --suffix .yaml)
-    values="vCenter.clusterId=test-id"
+    values="vCenter.clusterId=test-id,global.clusterDNS=10.43.0.10"
     helm template test-chart --kube-version ${KUBERNETES_VERSION} --set $values $chart_tmp > $yaml_tmp;
 
     chart_folder=$(mktemp -d)
@@ -120,7 +123,7 @@ check_airgap() {
         print $3 " " $5
     }
     ' $chart_folder/$chart_name/Chart.yaml `
-    if ! [ -z ${version_annotation} ]; then
+    if ! [[ -z ${version_annotation} ]]; then
         version_annotation=${version_annotation:0:-1}
         read lower_bound upper_bound <<< $version_annotation
 
@@ -143,6 +146,9 @@ check_airgap() {
             echo $image
         fi
     done
+
+    #clean-up
+    rm -f $yaml_tmp
 }
 
 declare -A NO_SYSTEM_REGISTRY