You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: gomod_proxy.go
    path of file: ./repos/goreleaser/internal/pipe/gomod
    
    the code of the file until where you have to start completion: // Package gomod provides go modules utilities, such as template variables and the ability to proxy the module from
// proxy.golang.org.
package gomod

import (
	"errors"
	"fmt"
	"io"
    
func (ProxyPipe) Run(ctx *context.Context) error {
	for i := range ctx.Config.Builds {
		build := &ctx.Config.Builds[i]
		if err := proxyBuild(ctx, build); err != nil {
			return err
		}
	}

	return nil
}