Move gitea api calls in own "client" package (#78)

continue #75
close #16
- fix regression (from #34) _thanks to @crystal_
- create own gitea client package
- more logging
- add mock impl of CertDB

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: crystal <crystal@noreply.codeberg.org>
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/78
Reviewed-by: crapStone <crapstone@noreply.codeberg.org>

.woodpecker.yml

@@ -1,3 +1,5 @@
+branches: main
+
 pipeline:
   # use vendor to cache dependencies
   vendor: