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>

server/gitea/fasthttp.go

@@ -0,0 +1,15 @@
+package gitea
+
+import (
+	"time"
+
+	"github.com/valyala/fasthttp"
+)
+
+func getFastHTTPClient() *fasthttp.Client {
+	return &fasthttp.Client{
+		MaxConnDuration:    60 * time.Second,
+		MaxConnWaitTimeout: 1000 * time.Millisecond,
+		MaxConnsPerHost:    128 * 16, // TODO: adjust bottlenecks for best performance with Gitea!
+	}
+}