chore(base-cluster): this is now supported 🥳 (#1135)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

charts/base-cluster/README.md.gotmpl

@@ -1,4 +1,6 @@
-[modeline]: # ( vim: set ft=markdown: )
+{{- $majorVersion := index ((.Files.Get "Chart.yaml" | fromYaml).version | split ".") "_0" -}}
+{{- $fluxMajorVersion := "2" -}}
+
 {{ template "chart.header" . }}
 {{ template "chart.deprecationWarning" . }}
 
@@ -17,7 +19,7 @@
 git init
 
 # create empty cluster HelmRelease;
-flux create helmrelease --export base-cluster -n flux-system --source HelmRepository/teuto-net.flux-system --chart base-cluster --chart-version 5.x.x > cluster.yaml
+flux create helmrelease --export base-cluster -n flux-system --source HelmRepository/teuto-net.flux-system --chart base-cluster --chart-version {{ $majorVersion }}.x.x > cluster.yaml
 
 # maybe use the following name for your cluster;
 kubectl get node -o jsonpath='{.items[0].metadata.annotations.cluster\.x-k8s\.io/cluster-name}'
@@ -30,7 +32,7 @@ vi cluster.yaml
 # create HelmRelease for flux to manage itself
 kubectl create namespace flux-system --dry-run=client -o yaml > flux.yaml
 flux create source helm --url https://fluxcd-community.github.io/helm-charts flux -n flux-system --export >> flux.yaml
-flux create helmrelease --export flux -n flux-system --source HelmRepository/flux.flux-system --chart flux2 --chart-version 2.x.x >> flux.yaml
+flux create helmrelease --export flux -n flux-system --source HelmRepository/flux.flux-system --chart flux2 --chart-version {{ $fluxMajorVersion }}.x.x >> flux.yaml
 
 # add, commit and push resources
 git add cluster.yaml flux.yaml
@@ -40,11 +42,11 @@ git push
 # after this you should be on the KUBECONFIG for the cluster
 # we explicitly do not use `flux bootstrap` or `flux install` as this creates kustomization stuff and installs flux manually
 kubectl apply --server-side -f flux.yaml # ignore the errors about missing CRDs
-helm install -n flux-system flux flux2 --repo https://fluxcd-community.github.io/helm-charts --version 2.x.x --atomic
+helm install -n flux-system flux flux2 --repo https://fluxcd-community.github.io/helm-charts --version {{ $fluxMajorVersion }}.x.x --atomic
 
 # manual initial installation of the chart, afterwards the chart takes over
 # after the installation finished, follow the on-screen instructions to configure your flux, distribute KUBECONFIGs, ...
-helm install -n flux-system base-cluster oci://ghcr.io/teutonet/teutonet-helm-charts/base-cluster --version 4.x.x --atomic --values <(cat cluster.yaml | yq -y .spec.values)
+helm install -n flux-system base-cluster oci://ghcr.io/teutonet/teutonet-helm-charts/base-cluster --version {{ $majorVersion }}.x.x --atomic --values <(cat cluster.yaml | yq -y .spec.values)
 
 # you can use this command to get the instructions again
 # e.g. when adding users, gitRepositories, ...
@@ -302,7 +304,7 @@ haven't already.
 ### 5.x.x -> 6.0.0
 
 The kyverno 2.x.x -> 3.x.x upgrade cannot be done without manual intervention, see
-https://artifacthub.io/packages/helm/kyverno/kyverno#option-1---uninstallation-and-reinstallation
+<https://artifacthub.io/packages/helm/kyverno/kyverno#option-1---uninstallation-and-reinstallation>
 
 So you have to backup your resources and delete the kyverno HelmReleases before the
 upgrade, they will be recreated in version 6.