fix(helm): revert app.kubernetes.io/part-of as a selector (coder#5806)

Deployment selectors are immutable!

Author: coadler

helm/templates/_helpers.tpl

@@ -14,11 +14,12 @@ Create chart name and version as used by the chart label.
 
 {{/*
 Selector labels
+
+!!!!! DO NOT ADD ANY MORE SELECTORS. IT IS A BREAKING CHANGE !!!!!
 */}}
 {{- define "coder.selectorLabels" -}}
 app.kubernetes.io/name: {{ include "coder.name" . }}
 app.kubernetes.io/instance: {{ .Release.Name }}
-app.kubernetes.io/part-of: {{ include "coder.name" . }}
 {{- end }}
 
 {{/*
@@ -27,6 +28,7 @@ Common labels
 {{- define "coder.labels" -}}
 helm.sh/chart: {{ include "coder.chart" . }}
 {{ include "coder.selectorLabels" . }}
+app.kubernetes.io/part-of: {{ include "coder.name" . }}
 {{- if .Chart.AppVersion }}
 app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
 {{- end }}

helm/templates/coder.yaml

@@ -24,7 +24,7 @@ spec:
   template:
     metadata:
       labels:
-        {{- include "coder.selectorLabels" . | nindent 8 }}
+        {{- include "coder.labels" . | nindent 8 }}
     spec:
       serviceAccountName: coder
       restartPolicy: Always