Remove unnecessary conversion (#139)

- Remove unnecessary type conversion.
- Enforce via CI

Co-authored-by: Gusted <williamzijl7@hotmail.com>
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/139
Reviewed-by: 6543 <6543@obermui.de>
Co-authored-by: Gusted <gusted@noreply.codeberg.org>
Co-committed-by: Gusted <gusted@noreply.codeberg.org>

server/handler/handler_sub_domain.go

@@ -29,7 +29,7 @@ func handleSubDomain(log zerolog.Logger, ctx *context.Context, giteaClient *gite
 
 	if targetOwner == "www" {
 		// www.codeberg.page redirects to codeberg.page // TODO: rm hardcoded - use cname?
-		ctx.Redirect("https://"+string(mainDomainSuffix[1:])+string(ctx.Path()), http.StatusPermanentRedirect)
+		ctx.Redirect("https://"+mainDomainSuffix[1:]+ctx.Path(), http.StatusPermanentRedirect)
 		return
 	}