outposts: Adding more flexibility to outposts in Kubernetes. (#1617)

* outposts/ldap: Support hard coded `uidNumber` and `gidNumber`.

* outposts: more options for image + labels

- Set outpost docker image in config.
- Set image pull secrets in outpost config.
- Add additional labels for easier targeting from
  custom services.

* Fix some linting errors.

* outposts: Rename `docker_image` to `container_image

website/docs/outposts/outposts.md

@@ -41,6 +41,9 @@ authentik_host_insecure: false
 authentik_host_browser:
 # Template used for objects created (deployments, services, secrets, etc)
 object_naming_template: ak-outpost-%(name)s
+# Use a specific docker image for this outpost rather than the default. This also applies to Kubernetes
+# outposts.
+conatiner_image:
 ########################################
 # Docker outpost specific settings
 ########################################
@@ -70,4 +73,7 @@ kubernetes_service_type: ClusterIP
 # - 'ingress'
 # - 'traefik middleware'
 kubernetes_disabled_components: []
+# If the above docker image is in a private repository, use these secrets to pull.
+# NOTE: The secret must be created manually in the namespace first.
+kubernetes_image_pull_secrets: []
 ```