Fix kubeconform check and improve it

- do "helm repo add" for the prometheus-community repo
- run checks for all k8s versions between 1.21.0-1.29.0

.ci/chart_test.sh

@@ -33,6 +33,8 @@ source ${PULSAR_HOME}/.ci/helm.sh
 # create cluster
 ci::create_cluster
 
+ci::helm_repo_add
+
 extra_opts=""
 if [[ "x${SYMMETRIC}" == "xtrue" ]]; then
     extra_opts="-s"

.ci/helm.sh

@@ -81,6 +81,13 @@ function ci::install_cert_manager() {
     echo "Successfully installed the cert manager."
 }
 
+function ci::helm_repo_add() {
+    echo "Adding the helm repo ..."
+    ${HELM} repo add prometheus-community https://prometheus-community.github.io/helm-charts
+    ${HELM} repo update
+    echo "Successfully added the helm repo."
+}
+
 function ci::print_pod_logs() {
     echo "Logs for all pulsar containers:"
     for k8sobject in $(${KUBECTL} get pods,jobs -n ${NAMESPACE} -l app=pulsar -o=name); do

.github/workflows/pulsar-helm-chart-ci.yaml

@@ -127,23 +127,28 @@ jobs:
             --validate-maintainers=false \
             --target-branch ${{ github.event.repository.default_branch }}
 
-      - name: Run kubeconform check
+      - name: Run kubeconform check for helm template with every major k8s version 1.21.0-1.29.0
         if: ${{ steps.check_changes.outputs.docs_only != 'true' }}
         run: |
           PULSAR_CHART_HOME=$(pwd)
           source ${PULSAR_CHART_HOME}/hack/common.sh
+          source ${PULSAR_CHART_HOME}/.ci/helm.sh
+          hack::ensure_kubectl
+          hack::ensure_helm
           hack::ensure_kubeconform
+          ci::helm_repo_add
           validate_helm_template_with_k8s_version() {
             local kube_version=$1
             echo "Validating helm template with kubeconform for k8s version $kube_version"
             helm template charts/pulsar --set kube-prometheus-stack.enabled=false --set components.pulsar_manager=true --kube-version $kube_version | \
               kubeconform -schema-location default -schema-location 'https://raw.githubusercontent.com/datreeio/CRDs-catalog/main/{{.Group}}/{{.ResourceKind}}_{{.ResourceAPIVersion}}.json' -strict -kubernetes-version $kube_version -summary
           }
-          helm dependency build charts/pulsar
           set -o pipefail
-          validate_helm_template_with_k8s_version 1.21.0
-          validate_helm_template_with_k8s_version 1.27.0
-
+          for k8s_version_part in {21..29}; do
+            k8s_version="1.${k8s_version_part}.0"
+            echo "Validating helm template with kubeconform for k8s version $k8s_version"
+            validate_helm_template_with_k8s_version $k8s_version
+          done
       - name: Wait for ssh connection when build fails
         # ssh access is enabled for builds in own forks
         uses: ./.github/actions/ssh-access