Embedded outpost (#1193)

* api: allow API requests as managed outpost's account when using secret_key

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* root: load secret key from env

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* outposts: make listener IP configurable

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* outpost/proxy: run outpost in background and pass requests conditionally

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* outpost: unify branding to embedded

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* web/admin: fix embedded outpost not being editable

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* web: fix mismatched host detection

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* tests/e2e: fix LDAP test not including user for embedded outpost

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* tests/e2e: fix user matching

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* api: add tests for secret_key auth

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* root: load environment variables using github.com/Netflix/go-env

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

internal/outpost/proxy/middleware.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	log "github.com/sirupsen/logrus"
+	"goauthentik.io/internal/utils/web"
 )
 
 // responseLogger is wrapper of http.ResponseWriter that keeps track of its HTTP status
@@ -107,7 +108,7 @@ func (h loggingHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	duration := float64(time.Since(t)) / float64(time.Millisecond)
 	h.logger.WithFields(log.Fields{
 		"host":              req.RemoteAddr,
-		"vhost":             getHost(req),
+		"vhost":             web.GetHost(req),
 		"request_protocol":  req.Proto,
 		"runtime":           fmt.Sprintf("%0.3f", duration),
 		"method":            req.Method,