Pass logger to fasthttp

- Use a logger with `FASTHTTP` prefix as fasthttp's logger so it's easy
to see what fasthttp is logging in console/journal.

server/setup.go

@@ -5,12 +5,20 @@ import (
 	"net/http"
 	"time"
 
+	"github.com/rs/zerolog/log"
+
 	"github.com/valyala/fasthttp"
 
 	"codeberg.org/codeberg/pages/server/cache"
 	"codeberg.org/codeberg/pages/server/utils"
 )
 
+type fasthttpLogger struct{}
+
+func (fasthttpLogger) Printf(format string, args ...interface{}) {
+	log.Printf("[FASTHTTP] "+format, args...)
+}
+
 func SetupServer(handler fasthttp.RequestHandler) *fasthttp.Server {
 	// Enable compression by wrapping the handler with the compression function provided by FastHTTP
 	compressedHandler := fasthttp.CompressHandlerBrotliLevel(handler, fasthttp.CompressBrotliBestSpeed, fasthttp.CompressBestSpeed)
@@ -22,6 +30,7 @@ func SetupServer(handler fasthttp.RequestHandler) *fasthttp.Server {
 		NoDefaultDate:                true,
 		ReadTimeout:                  30 * time.Second, // needs to be this high for ACME certificates with ZeroSSL & HTTP-01 challenge
 		Concurrency:                  1024 * 32,        // TODO: adjust bottlenecks for best performance with Gitea!
+		Logger:                       fasthttpLogger{},
 	}
 }