test(service): add IPv6 and dual-stack configuration tests

Add helm-unittest tests for IPv6 and dual-stack Service configuration:
- Default behavior (no ipFamilyPolicy/ipFamilies set)
- SingleStack, PreferDualStack, RequireDualStack policies
- IPv4 only, IPv6 only configurations
- Dual-stack with IPv4 primary and IPv6 primary
- Combined policy and families configurations

Add NOTES.txt with IPv6/dual-stack information:
- Display configured IP family policy
- Show IP families list
- Warning when IPv6 is primary (probe compatibility note)
- Warning when IPv6 used without policy

Tests ensure IPv6 and dual-stack work correctly for all scenarios.

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>

charts/jellyfin/templates/NOTES.txt

@@ -0,0 +1,42 @@
+Thank you for installing {{ .Chart.Name }}.
+
+Your release is named {{ .Release.Name }}.
+
+To learn more about the release, try:
+
+  $ helm status {{ .Release.Name }}
+  $ helm get all {{ .Release.Name }}
+
+{{- if .Values.ingress.enabled }}
+
+Jellyfin is available via Ingress at:
+{{- range .Values.ingress.hosts }}
+  http{{ if $.Values.ingress.tls }}s{{ end }}://{{ .host }}{{ (index .paths 0).path }}
+{{- end }}
+{{- else }}
+
+To access Jellyfin, you can use port-forwarding:
+
+  $ kubectl port-forward --namespace {{ .Release.Namespace }} svc/{{ include "jellyfin.fullname" . }} {{ .Values.service.port }}:{{ .Values.service.port }}
+
+Then visit http://localhost:{{ .Values.service.port }} in your browser.
+{{- end }}
+
+{{- if or .Values.service.ipFamilyPolicy .Values.service.ipFamilies }}
+
+Service IP Configuration:
+{{- if .Values.service.ipFamilyPolicy }}
+  IP Family Policy: {{ .Values.service.ipFamilyPolicy }}
+{{- end }}
+{{- if .Values.service.ipFamilies }}
+  IP Families: {{ .Values.service.ipFamilies | join ", " }}
+  {{- if eq (index .Values.service.ipFamilies 0) "IPv6" }}
+  ⚠ NOTE: IPv6 primary - ensure your probes use httpGet instead of tcpSocket for compatibility
+  {{- end }}
+  {{- if has "IPv6" .Values.service.ipFamilies }}
+  {{- if not .Values.service.ipFamilyPolicy }}
+  ⚠ WARNING: ipFamilies includes IPv6 but ipFamilyPolicy is not set
+  {{- end }}
+  {{- end }}
+{{- end }}
+{{- end }}

charts/jellyfin/tests/service_ipv6_test.yaml

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+suite: test service ipv6 and dual-stack
+templates:
+  - service.yaml
+tests:
+  - it: should not set ipFamilyPolicy by default
+    asserts:
+      - isNull:
+          path: spec.ipFamilyPolicy
+
+  - it: should not set ipFamilies by default
+    asserts:
+      - isNull:
+          path: spec.ipFamilies
+
+  - it: should set ipFamilyPolicy when specified
+    set:
+      service.ipFamilyPolicy: PreferDualStack
+    asserts:
+      - equal:
+          path: spec.ipFamilyPolicy
+          value: PreferDualStack
+
+  - it: should support SingleStack policy
+    set:
+      service.ipFamilyPolicy: SingleStack
+    asserts:
+      - equal:
+          path: spec.ipFamilyPolicy
+          value: SingleStack
+
+  - it: should support RequireDualStack policy
+    set:
+      service.ipFamilyPolicy: RequireDualStack
+    asserts:
+      - equal:
+          path: spec.ipFamilyPolicy
+          value: RequireDualStack
+
+  - it: should set ipFamilies for IPv4 only
+    set:
+      service.ipFamilies:
+        - IPv4
+    asserts:
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv4
+
+  - it: should set ipFamilies for IPv6 only
+    set:
+      service.ipFamilies:
+        - IPv6
+    asserts:
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv6
+
+  - it: should set ipFamilies for dual-stack IPv4 primary
+    set:
+      service.ipFamilies:
+        - IPv4
+        - IPv6
+    asserts:
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv4
+      - equal:
+          path: spec.ipFamilies[1]
+          value: IPv6
+
+  - it: should set ipFamilies for dual-stack IPv6 primary
+    set:
+      service.ipFamilies:
+        - IPv6
+        - IPv4
+    asserts:
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv6
+      - equal:
+          path: spec.ipFamilies[1]
+          value: IPv4
+
+  - it: should work with PreferDualStack and both families
+    set:
+      service.ipFamilyPolicy: PreferDualStack
+      service.ipFamilies:
+        - IPv4
+        - IPv6
+    asserts:
+      - equal:
+          path: spec.ipFamilyPolicy
+          value: PreferDualStack
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv4
+      - equal:
+          path: spec.ipFamilies[1]
+          value: IPv6
+
+  - it: should work with RequireDualStack and both families
+    set:
+      service.ipFamilyPolicy: RequireDualStack
+      service.ipFamilies:
+        - IPv6
+        - IPv4
+    asserts:
+      - equal:
+          path: spec.ipFamilyPolicy
+          value: RequireDualStack
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv6
+      - equal:
+          path: spec.ipFamilies[1]
+          value: IPv4
+
+  - it: should work with SingleStack IPv6 only
+    set:
+      service.ipFamilyPolicy: SingleStack
+      service.ipFamilies:
+        - IPv6
+    asserts:
+      - equal:
+          path: spec.ipFamilyPolicy
+          value: SingleStack
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv6