feature: redirect /admin to /admin/ for code-server

code-server uses relative URLs in its HTML and computes its own redirect
targets based on req.originalUrl. Without a trailing slash on /admin,
the browser resolves those relative URLs against /, dropping the prefix
(e.g. landing on /?folder=/srv instead of /admin/?folder=/srv).
Add a redirectRegex middleware that 302s the bare /admin to /admin/
before any other middleware runs.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: LuukBlankenstijn

Chart.yaml

@@ -15,7 +15,7 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.1.3
+version: 0.1.4
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to

templates/ingressroute.yaml

@@ -19,6 +19,7 @@ spec:
     - kind: Rule
       match: Host(`{{ index .Values.domains 0 }}`) && PathPrefix(`/admin`)
       middlewares:
+        - name: {{ $fullName }}-admin-slash
         - name: {{ $fullName }}-auth
         - name: {{ $fullName }}-strip-admin
       services:

templates/middleware.yaml

@@ -29,6 +29,18 @@ spec:
 ---
 apiVersion: traefik.io/v1alpha1
 kind: Middleware
+metadata:
+  name: {{ include "static-webhost.fullname" . }}-admin-slash
+  labels:
+    {{- include "static-webhost.labels" . | nindent 4 }}
+spec:
+  redirectRegex:
+    regex: ^(https?://[^/]+)/admin$
+    replacement: ${1}/admin/
+    permanent: false
+---
+apiVersion: traefik.io/v1alpha1
+kind: Middleware
 metadata:
   name: {{ include "static-webhost.fullname" . }}-strip-admin
   labels: