feat: support HTTP redirect for forward authentication middleware in Traefik (#368)

* feat: support HTTP redirect for forward authentication middleware in Traefik

* fix(docs): fix my terrible merge 

Signed-off-by: Jason Cameron <jasoncameron.all@gmail.com>

* chore: fix typo in docs

Signed-off-by: Jason Cameron <jasoncameron.all@gmail.com>

* fix(ci): add forwardauth

Signed-off-by: Jason Cameron <jasoncameron.all@gmail.com>

* chore: improve doc, target must be a space

* chore: changelog

* fix: validate X-Forwarded headers and check redirect domain

* chore: refactor error handling

* fix(doc): cookie traefik

* fix: tests merge

* Update docs/docs/admin/environments/traefik.mdx

Co-authored-by: Henri Vasserman <henv@hot.ee>
Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Jason Cameron <git@jasoncameron.dev>
Signed-off-by: Jason Cameron <jasoncameron.all@gmail.com>
Signed-off-by: Xe Iaso <me@xeiaso.net>
Co-authored-by: Jason Cameron <git@jasoncameron.dev>
Co-authored-by: Jason Cameron <jasoncameron.all@gmail.com>
Co-authored-by: Xe Iaso <me@xeiaso.net>
Co-authored-by: Henri Vasserman <henv@hot.ee>

docs/docs/CHANGELOG.md

@@ -261,6 +261,7 @@ And some cleanups/refactors were added:
 - Bump AI-robots.txt to version 1.37
 - Make progress bar styling more compatible (UXP, etc)
 - Add `--strip-base-prefix` flag/envvar to strip the base prefix from request paths when forwarding to target servers
+- Added support to use Traefik forwardAuth middleware
 - Fix an off-by-one in the default threshold config
 - Add functionality for HS512 JWT algorithm
 - Add support for dynamic cookie domains with the `--cookie-dynamic-domain`/`COOKIE_DYNAMIC_DOMAIN` flag/envvar