enhancement: introduce theme processing (#9133)

* enhancement: introduce theme processing

* enhancement: introduce theme processing

* enhancement: add theme processing tests and changelog

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

Co-authored-by: Michael Barz <michael.barz@zeitgestalten.eu>

* fix: ci findings

* Apply suggestions from code review

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

* enhancement: use the theme assets from web instead of having them inside the oCis repo (license clash Apache vs. AGPLv3)

* fix: golangci tagalign order

* fix: rename UnifiedRoleUploader to UnifiedRoleEditorLite

* fix: some typos

Co-authored-by: Michael Barz <michael.barz@zeitgestalten.eu>

* enhancement: export supported theme logo upload filetypes

* chore: bump reva

* fix: allow init func

---------

Co-authored-by: Michael Barz <michael.barz@zeitgestalten.eu>
Co-authored-by: Martin <github@diemattels.at>

services/frontend/pkg/revaconfig/config.go

@@ -9,6 +9,7 @@ import (
 	"path/filepath"
 	"strconv"
 
+	"github.com/owncloud/ocis/v2/ocis-pkg/capabilities"
 	"github.com/owncloud/ocis/v2/ocis-pkg/config/defaults"
 	"github.com/owncloud/ocis/v2/ocis-pkg/log"
 	"github.com/owncloud/ocis/v2/ocis-pkg/version"
@@ -290,6 +291,7 @@ func FrontendConfigFromStruct(cfg *config.Config, logger log.Logger) (map[string
 								"share_jail": true,
 								"max_quota":  cfg.MaxQuota,
 							},
+							"theme": capabilities.Default().Theme,
 							"search": map[string]interface{}{
 								"property": map[string]interface{}{
 									"name": map[string]interface{}{