[common] Add common chart from KaH

charts/common/templates/addons/netshoot/_container.tpl

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+{{/*
+The netshoot sidecar container to be inserted.
+*/}}
+{{- define "common.addon.netshoot.container" -}}
+name: netshoot
+image: "{{ .Values.addons.netshoot.image.repository }}:{{ .Values.addons.netshoot.image.tag }}"
+imagePullPolicy: {{ .Values.addons.netshoot.pullPolicy }}
+{{- with .Values.addons.netshoot.securityContext }}
+securityContext:
+  {{- toYaml . | nindent 2 }}
+{{- end }}
+{{- with .Values.addons.netshoot.env }}
+env:
+{{- range $k, $v := . }}
+  - name: {{ $k }}
+    value: {{ $v | quote }}
+{{- end }}
+{{- end }}
+command:
+  - /bin/sh
+  - -c
+  - sleep infinity
+{{- with .Values.addons.netshoot.resources }}
+resources:
+  {{- toYaml . | nindent 2 }}
+{{- end }}
+{{- end -}}

charts/common/templates/addons/netshoot/_netshoot.tpl

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+{{/*
+Template to render netshoot addon
+It will include / inject the required templates based on the given values.
+*/}}
+{{- define "common.addon.netshoot" -}}
+{{- if .Values.addons.netshoot.enabled -}}
+  {{/* Append the netshoot container to the additionalContainers */}}
+  {{- $container := include "common.addon.netshoot.container" . | fromYaml -}}
+  {{- if $container -}}
+    {{- $_ := set .Values.additionalContainers "addon-netshoot" $container -}}
+  {{- end -}}
+{{- end -}}
+{{- end -}}