Add Authentik SSO integration for Jellyfin (#239)

## Summary
- Add Authentik OIDC provider + application for Jellyfin via blueprint (all authenticated users allowed, no policy binding)
- Wire `jellyfin-client-secret` through ExternalSecret and Authentik worker deployment
- Install [jellyfin-plugin-sso](https://github.com/9p4/jellyfin-plugin-sso) v4.0.0.3 via Ansible, with OIDC config template
- Authentik `admins` group maps to Jellyfin administrator role
- Local login left enabled; SSO is additive

## Deployment and Testing
- [ ] Sync ArgoCD `authentik` app on branch — verify provider + application appear in Authentik admin
- [ ] `mise run provision-indri -- --tags jellyfin --check --diff` (dry run)
- [ ] `mise run provision-indri -- --tags jellyfin` (deploy plugin + config)
- [ ] Test SSO flow: `https://jellyfin.ops.eblu.me/sso/OID/start/authentik`
- [ ] Verify `eblume` account auto-links via `preferred_username` match
- [ ] Verify admins group → Jellyfin admin
- [ ] Reset ArgoCD app revision to main after merge

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/239

ansible/roles/jellyfin/defaults/main.yml

@@ -21,3 +21,10 @@ jellyfin_webdir: "{{ jellyfin_cask_app_path }}/Contents/Resources/jellyfin-web"
 
 # Log directory
 jellyfin_log_dir: "{{ ansible_env.HOME }}/Library/Logs"
+
+# SSO plugin configuration
+jellyfin_sso_plugin_version: "4.0.0.3"
+jellyfin_sso_client_id: jellyfin
+jellyfin_sso_client_secret: ""
+jellyfin_sso_provider_name: authentik
+jellyfin_plugins_dir: "{{ jellyfin_data_dir }}/plugins"

ansible/roles/jellyfin/tasks/main.yml

@@ -28,3 +28,36 @@
   when: jellyfin_launchctl_check.rc != 0
   changed_when: true
   failed_when: false
+
+# SSO plugin installation
+- name: Ensure SSO-Auth plugin directory exists
+  ansible.builtin.file:
+    path: "{{ jellyfin_plugins_dir }}/SSO-Auth_{{ jellyfin_sso_plugin_version }}"
+    state: directory
+    mode: '0755'
+
+- name: Download SSO-Auth plugin archive
+  ansible.builtin.get_url:
+    url: "https://github.com/9p4/jellyfin-plugin-sso/releases/download/v{{ jellyfin_sso_plugin_version }}/sso-authentication_{{ jellyfin_sso_plugin_version }}.zip"
+    dest: "/tmp/sso-authentication_{{ jellyfin_sso_plugin_version }}.zip"
+    mode: '0644'
+
+- name: Extract SSO-Auth plugin
+  ansible.builtin.unarchive:
+    src: "/tmp/sso-authentication_{{ jellyfin_sso_plugin_version }}.zip"
+    dest: "{{ jellyfin_plugins_dir }}/SSO-Auth_{{ jellyfin_sso_plugin_version }}"
+    remote_src: true
+  notify: Reload jellyfin
+
+- name: Ensure plugin configurations directory exists
+  ansible.builtin.file:
+    path: "{{ jellyfin_plugins_dir }}/configurations"
+    state: directory
+    mode: '0755'
+
+- name: Deploy SSO-Auth plugin configuration
+  ansible.builtin.template:
+    src: sso-auth.xml.j2
+    dest: "{{ jellyfin_plugins_dir }}/configurations/SSO-Auth.xml"
+    mode: '0644'
+  notify: Reload jellyfin

ansible/roles/jellyfin/templates/sso-auth.xml.j2

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- {{ ansible_managed }} -->
+<PluginConfiguration xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
+  <SamlConfigs />
+  <OidConfigs>
+    <item>
+      <key><string>{{ jellyfin_sso_provider_name }}</string></key>
+      <value>
+        <PluginConfiguration>
+          <OidEndpoint>https://authentik.ops.eblu.me/application/o/jellyfin</OidEndpoint>
+          <OidClientId>{{ jellyfin_sso_client_id }}</OidClientId>
+          <OidSecret>{{ jellyfin_sso_client_secret }}</OidSecret>
+          <Enabled>true</Enabled>
+          <EnableAuthorization>true</EnableAuthorization>
+          <EnableAllFolders>true</EnableAllFolders>
+          <EnabledFolders />
+          <AdminRoles><string>admins</string></AdminRoles>
+          <Roles />
+          <EnableFolderRoles>false</EnableFolderRoles>
+          <FolderRoleMappings />
+          <RoleClaim>groups</RoleClaim>
+          <OidScopes>
+            <string>openid</string>
+            <string>email</string>
+            <string>profile</string>
+          </OidScopes>
+          <SchemeOverride>https</SchemeOverride>
+          <CanonicalLinks />
+        </PluginConfiguration>
+      </value>
+    </item>
+  </OidConfigs>
+</PluginConfiguration>