helm: fix admin secret template paths and remove duplicate (#7690)

* add admin and worker to helm charts

* workers are stateless, admin is stateful

* removed the duplicate admin-deployment.yaml

* address comments

* address comments

* purge

* Update README.md

* Update k8s/charts/seaweedfs/templates/admin/admin-ingress.yaml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* address comments

* address comments

* supports Kubernetes versions from v1.14 to v1.30+, ensuring broad compatibility

* add probe for workers

* address comments

* add a todo

* chore: trigger CI

* use port name for probes in admin statefulset

* add secrets to admin helm chart

* fix error .Values.admin.secret.existingSecret

* helm: fix admin secret template paths and remove duplicate

- Fix value paths to use .Values.admin.secret.existingSecret instead of .Values.existingSecret
- Use templated secret name {{ template "seaweedfs.name" . }}-admin-secret
- Add .Values.admin.enabled check to admin-secret.yaml
- Remove duplicate admin-secret.yaml from templates/ root

* helm: address PR review feedback

- Only pass adminUser/adminPassword args when auth is enabled (fixes regression)
- Use $adminSecretName variable to reduce duplication (DRY)
- Only create admin-secret when adminPassword is set
- Add documentation comments for existingSecret, userKey, pwKey fields
- Clarify that empty adminPassword disables authentication

* helm: quote admin credentials to handle spaces

* helm: fix yaml lint errors (comment spacing, trailing blank line)

* helm: add validation for existingSecret requiring userKey and pwKey

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Ubuntu <morez.martin@gmail.com>

k8s/charts/seaweedfs/templates/admin/admin-secret.yaml

@@ -0,0 +1,20 @@
+{{- if and .Values.admin.enabled .Values.admin.secret.adminPassword (not .Values.admin.secret.existingSecret) }}
+apiVersion: v1
+kind: Secret
+type: Opaque
+metadata:
+  name: {{ template "seaweedfs.name" . }}-admin-secret
+  namespace: {{ .Release.Namespace }}
+  annotations:
+    "helm.sh/resource-policy": keep
+    "helm.sh/hook": "pre-install,pre-upgrade"
+  labels:
+    app.kubernetes.io/name: {{ template "seaweedfs.name" . }}
+    helm.sh/chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/component: admin
+data:
+  adminUser: {{ .Values.admin.secret.adminUser | b64enc }}
+  adminPassword: {{ .Values.admin.secret.adminPassword | b64enc }}
+{{- end}}