Use proxy for pull mirror (#22771) (#22772)

- Backport #22771
  - Use the proxy (if one is specified) for pull mirrors syncs.
- Pulled the code from
c2774d9e80/modules/git/repo.go (L164-L170)
  - Downstream issue: https://codeberg.org/forgejo/forgejo/issues/302

---------

Co-authored-by: zeripath <art27@cantab.net>

modules/git/repo.go

@@ -164,10 +164,8 @@ func CloneWithArgs(ctx context.Context, args []CmdArg, from, to string, opts Clo
 
 	envs := os.Environ()
 	u, err := url.Parse(from)
-	if err == nil && (strings.EqualFold(u.Scheme, "http") || strings.EqualFold(u.Scheme, "https")) {
-		if proxy.Match(u.Host) {
-			envs = append(envs, fmt.Sprintf("https_proxy=%s", proxy.GetProxyURL()))
-		}
+	if err == nil {
+		envs = proxy.EnvWithProxy(u)
 	}
 
 	stderr := new(bytes.Buffer)