feat(garage,authentik): console multi-domain + standalone proxy outpost

Two related additions for gating a cross-host service (garage WebUI on a
storage host) behind authentik without breaking on TLS or X-Forwarded-Host:

garage role:
- Add garage_webui_domains (list), mirroring garage_s3_domains. The
  console router now accepts every entry, so a DMZ reverseproxy can use a
  backend_host whose cert SAN matches an internal *.int.* name instead of
  connecting by IP (which fails acme cert verification). Defaults to the
  single garage_webui_domain so existing inventories are unaffected.

authentik_outpost_proxy role (new):
- Standalone proxy (ForwardAuth) outpost, modelled on authentik_outpost_ldap.
  Co-locate it with the protected service so the ForwardAuth subrequest
  reaches authentik over the local docker network. The embedded outpost
  only works for services on the authentik host: a cross-host subrequest
  routed through an extra reverse-proxy hop arrives with a polluted
  X-Forwarded-Host (port/comma-appended), which the outpost no longer
  matches against the provider's external_host (404).

roles/authentik_outpost_proxy/README.md

@@ -0,0 +1,58 @@
+# authentik_outpost_proxy
+
+Deploys an [authentik](https://goauthentik.io) proxy (ForwardAuth)
+outpost via Docker Compose. The outpost serves the
+`/outpost.goauthentik.io/auth/*` endpoints locally, so a Traefik
+`ForwardAuth` middleware on the same host can gate services behind
+authentik without routing the auth subrequest through additional reverse
+proxies.
+
+Use this when the protected service runs on a **different host** than the
+authentik server: the embedded outpost only works for services co-located
+with authentik (the subrequest must reach it without an intermediate proxy
+mangling `X-Forwarded-Host`). Co-locating a proxy outpost with the service
+keeps the ForwardAuth subrequest on the local docker network.
+
+The outpost connects back to an authentik server using an outpost token
+issued in the authentik admin interface (register the outpost there and
+assign the proxy providers it should serve). The image version must match
+the authentik server version.
+
+## Requirements
+
+- Docker and Docker Compose on the target host (e.g. via
+  `digitalboard.core.base`)
+- Ansible collection: `community.docker`
+- An authentik proxy outpost registered on the server, with the proxy
+  providers for the protected services assigned to it.
+
+## Role variables
+
+| Variable | Default | Description |
+| --- | --- | --- |
+| `authentik_outpost_proxy_image` | `ghcr.io/goauthentik/proxy:2026.2.2` | Outpost image (match the server version). |
+| `authentik_outpost_proxy_host` | `https://authentik.local.test` | URL of the authentik server. |
+| `authentik_outpost_proxy_token` | `changeme` | Outpost token — **override this**. |
+| `authentik_outpost_proxy_insecure` | `"true"` | Skip TLS verification toward the authentik server. |
+| `authentik_outpost_proxy_network` | `proxy` | Docker network the local Traefik routers and this outpost share. |
+| `authentik_outpost_proxy_extra_hosts` | `[]` | Extra `host:ip` entries for in-container DNS. |
+
+The local ForwardAuth middleware then points at the container over the
+shared network, e.g.
+`http://authentik-outpost-proxy-proxy-1:9000/outpost.goauthentik.io/auth/traefik`.
+
+## Example
+
+```yaml
+- hosts: storage
+  become: true
+  roles:
+    - role: digitalboard.core.authentik_outpost_proxy
+      vars:
+        authentik_outpost_proxy_host: "https://auth.example.com"
+        authentik_outpost_proxy_token: "{{ vault_authentik_proxy_outpost_token }}"
+```
+
+## License
+
+MIT-0

roles/authentik_outpost_proxy/defaults/main.yml

@@ -0,0 +1,28 @@
+#SPDX-License-Identifier: MIT-0
+---
+# defaults file for authentik_outpost_proxy
+
+# Base directory configuration (inherited from base role or defined here)
+docker_compose_base_dir: /etc/docker/compose
+docker_volume_base_dir: /srv/data
+
+# Service configuration
+authentik_outpost_proxy_service_name: authentik-outpost-proxy
+authentik_outpost_proxy_docker_compose_dir: "{{ docker_compose_base_dir }}/{{ authentik_outpost_proxy_service_name }}"
+
+# Container image (must match authentik server version)
+authentik_outpost_proxy_image: "ghcr.io/goauthentik/proxy:2026.2.2"
+
+# Connection to authentik server
+authentik_outpost_proxy_host: "https://authentik.local.test"
+authentik_outpost_proxy_token: "changeme"
+authentik_outpost_proxy_insecure: "true"
+
+# Traefik network the service-side routers live on, so the local
+# ForwardAuth middleware can reach this outpost over the docker network.
+authentik_outpost_proxy_network: "proxy"
+
+# Extra hosts for DNS resolution within the container (e.g. pinning the
+# authentik FQDN to a backend IP when the public name is unreachable).
+authentik_outpost_proxy_extra_hosts: []
+# - "auth.example.com:192.168.56.11"

roles/authentik_outpost_proxy/handlers/main.yml

@@ -0,0 +1,3 @@
+#SPDX-License-Identifier: MIT-0
+---
+# handlers file for authentik_outpost_proxy

roles/authentik_outpost_proxy/meta/main.yml

@@ -0,0 +1,28 @@
+#SPDX-License-Identifier: MIT-0
+galaxy_info:
+  author: digitalboard
+  description: Deploy an authentik proxy (ForwardAuth) outpost via Docker Compose, co-located with the services it protects
+  company: Digitalboard
+  license: MIT-0
+
+  min_ansible_version: "2.14"
+
+  platforms:
+    - name: Debian
+      versions:
+        - bookworm
+    - name: Ubuntu
+      versions:
+        - jammy
+        - noble
+
+  galaxy_tags:
+    - authentik
+    - proxy
+    - forwardauth
+    - outpost
+    - sso
+    - docker
+    - digitalboard
+
+dependencies: []

roles/authentik_outpost_proxy/tasks/main.yml

@@ -0,0 +1,26 @@
+#SPDX-License-Identifier: MIT-0
+---
+# tasks file for authentik_outpost_proxy
+
+- name: Create docker compose directory
+  file:
+    path: "{{ authentik_outpost_proxy_docker_compose_dir }}"
+    state: directory
+    mode: '0755'
+
+- name: Create docker-compose file for authentik proxy outpost
+  template:
+    src: docker-compose.yml.j2
+    dest: "{{ authentik_outpost_proxy_docker_compose_dir }}/docker-compose.yml"
+    mode: '0644'
+
+- name: Start authentik proxy outpost container
+  community.docker.docker_compose_v2:
+    project_src: "{{ authentik_outpost_proxy_docker_compose_dir }}"
+    state: present
+    wait: true
+    wait_timeout: 120
+  retries: 3
+  delay: 15
+  register: result
+  until: result is not failed

roles/authentik_outpost_proxy/templates/docker-compose.yml.j2

@@ -0,0 +1,22 @@
+services:
+  proxy:
+    image: {{ authentik_outpost_proxy_image }}
+    restart: unless-stopped
+    environment:
+      AUTHENTIK_HOST: {{ authentik_outpost_proxy_host }}
+      AUTHENTIK_TOKEN: {{ authentik_outpost_proxy_token }}
+      AUTHENTIK_INSECURE: "{{ authentik_outpost_proxy_insecure }}"
+{% if authentik_outpost_proxy_extra_hosts | length > 0 %}
+    extra_hosts:
+{%   for host in authentik_outpost_proxy_extra_hosts %}
+      - "{{ host }}"
+{%   endfor %}
+{% endif %}
+    labels:
+      - traefik.enable=false
+    networks:
+      - {{ authentik_outpost_proxy_network }}
+
+networks:
+  {{ authentik_outpost_proxy_network }}:
+    external: true

roles/authentik_outpost_proxy/tests/inventory

@@ -0,0 +1,2 @@
+#SPDX-License-Identifier: MIT-0
+localhost

roles/authentik_outpost_proxy/tests/test.yml

@@ -0,0 +1,6 @@
+#SPDX-License-Identifier: MIT-0
+---
+- hosts: localhost
+  remote_user: root
+  roles:
+    - authentik_outpost_proxy

roles/authentik_outpost_proxy/vars/main.yml

@@ -0,0 +1,3 @@
+#SPDX-License-Identifier: MIT-0
+---
+# vars file for authentik_outpost_proxy

roles/garage/defaults/main.yml

@@ -20,7 +20,15 @@ garage_image: "dxflrs/garage:v2.1.0"
 garage_s3_domains:
   - "storage.local.test"
 garage_web_domain: "web.storage.local.test"
+# Canonical WebUI console hostname (first entry of garage_webui_domains).
 garage_webui_domain: "console.storage.local.test"
+# FQDNs the WebUI console router accepts. The first entry is the canonical
+# public domain; further entries cover internal *.int.* names so a DMZ
+# reverseproxy can use a backend_host whose cert SAN matches (same pattern
+# as garage_s3_domains). Defaults to just the canonical domain so existing
+# inventories that only set garage_webui_domain keep working unchanged.
+garage_webui_domains:
+  - "{{ garage_webui_domain }}"
 
 # Garage WebUI configuration
 garage_webui_enabled: true

roles/garage/meta/argument_specs.yml

@@ -45,7 +45,16 @@ argument_specs:
       garage_webui_domain:
         type: str
         default: console.storage.local.test
-        description: Hostname serving the WebUI console.
+        description: Canonical WebUI console hostname (first entry of C(garage_webui_domains)).
+      garage_webui_domains:
+        type: list
+        elements: str
+        default: ['console.storage.local.test']
+        description:
+          - FQDNs the WebUI console router accepts. The first entry is the
+            canonical public domain; further entries cover internal
+            C(*.int.*) names so a DMZ reverseproxy can use a C(backend_host)
+            whose cert SAN matches. Defaults to just C(garage_webui_domain).
 
       garage_webui_enabled:
         type: bool

roles/garage/templates/docker-compose.yml.j2

@@ -49,7 +49,7 @@ services:
     labels:
       - traefik.enable=true
       - traefik.docker.network={{ garage_traefik_network }}
-      - traefik.http.routers.{{ garage_service_name }}-console.rule=Host(`{{ garage_webui_domain }}`)
+      - traefik.http.routers.{{ garage_service_name }}-console.rule={% for d in garage_webui_domains %}Host(`{{ d }}`){% if not loop.last %} || {% endif %}{% endfor +%}
 {% if garage_use_ssl %}
       - traefik.http.routers.{{ garage_service_name }}-console.entrypoints=websecure
       - traefik.http.routers.{{ garage_service_name }}-console.tls=true