chore!: remove support for Kubernetes versions < 1.21

BREAKING CHANGE: The chart now requires Kubernetes 1.21

Author: morremeyer

charts/mailtrain/Chart.yaml

@@ -2,7 +2,6 @@ apiVersion: v2
 name: mailtrain
 description: Runs mailtrain in your kubernetes cluster
 type: application
-version: 1.2.3
+version: 2.0.0
 maintainers:
   - name: morremeyer
-    email: [email protected]

charts/mailtrain/README.md

@@ -1,14 +1,18 @@
 # mailtrain
 
-![Version: 1.2.3](https://img.shields.io/badge/Version-1.2.3-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square)
+![Version: 2.0.0](https://img.shields.io/badge/Version-2.0.0-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square)
 
 Runs mailtrain in your kubernetes cluster
 
 ## Maintainers
 
 | Name | Email | Url |
 | ---- | ------ | --- |
-| morremeyer | <[email protected]> |  |
+| morremeyer |  |  |
+
+## Upgrading
+
+See [the upgrading instructions](UPGRADING.md) for upgrades with breaking changes.
 
 ## Values
 

charts/mailtrain/README.md.gotmpl

@@ -7,4 +7,9 @@
 {{ template "chart.maintainersSection" . }}
 {{ template "chart.sourcesSection" . }}
 {{ template "chart.requirementsSection" . }}
+
+## Upgrading
+
+See [the upgrading instructions](UPGRADING.md) for upgrades with breaking changes.
+
 {{ template "chart.valuesSection" . }}

charts/mailtrain/UPGRADING.md

@@ -0,0 +1,7 @@
+# Upgrading
+
+## 1.2.3 to 2.0.0
+
+### Kubernetes Version
+
+If you set `ingress.enabled: true`, this chart is only compatible with Kubernetes 1.21 and newer.

charts/mailtrain/templates/ingress.yaml

@@ -1,13 +1,7 @@
 {{- if .Values.ingress.enabled -}}
 {{- $fullName := include "mailtrain.fullname" . -}}
 {{- $svcPort := .Values.service.port -}}
-{{- if .Capabilities.APIVersions.Has "networking.k8s.io/v1" }}
 apiVersion: networking.k8s.io/v1
-{{- else if semverCompare ">=1.14-0" .Capabilities.KubeVersion.GitVersion -}}
-apiVersion: networking.k8s.io/v1beta1
-{{- else -}}
-apiVersion: extensions/v1beta1
-{{- end }}
 kind: Ingress
 metadata:
   name: {{ $fullName }}