minimal webfinger (#5373)

* initial webfinger stub

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* add webfinger to proxy, return current host

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* some cleanup

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* allow passing multiple rel params

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* introduce interfaces

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* parse oidc auth token

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* add templating, drop chain, use map of relation providers

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* fix ocis url yaml

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* fix typos

Co-authored-by: Dominik Schmidt <dschmidt@owncloud.com>

* switch to userinfo claims

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* readme cleanup

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* add TODO.md with ideas

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* replace subject on authenticated request responses

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* Apply suggestions from code review

Co-authored-by: Martin <github@diemattels.at>

* markdown lint

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* return a 401 when bearer token expired, some more docs

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* Apply suggestions from code review

Co-authored-by: Martin <github@diemattels.at>

* fix docs

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* clarify env var

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* extract handler func

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* use correct service in reflex.conf

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* test relations

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

* Update services/webfinger/pkg/config/config.go

---------

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>
Co-authored-by: Dominik Schmidt <dschmidt@owncloud.com>
Co-authored-by: Martin <github@diemattels.at>

services/webfinger/cmd/webfinger/main.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"os"
+
+	"github.com/owncloud/ocis/v2/services/webfinger/pkg/command"
+	"github.com/owncloud/ocis/v2/services/webfinger/pkg/config/defaults"
+)
+
+func main() {
+	if err := command.Execute(defaults.DefaultConfig()); err != nil {
+		os.Exit(1)
+	}
+}