cmd/gitmirror: update build image to Go 1.14
The timeout added in CL 35124 doesn't seem to be working as intended.
Update to a supported version of Go before investigating further.
Also remove the explicit GOPROXY override, since the default behavior
as of Go 1.13 uses the Go module mirror¹.
¹ https://golang.org/doc/go1.13#introduction
For golang/go#35124.
Change-Id: Ia01abc530f0284791fe6e57ce5700c0ebc75268e
Reviewed-on: https://go-review.googlesource.com/c/build/+/227858
Reviewed-by: Alexander Rakoczy <alex@golang.org>
diff --git a/cmd/gitmirror/Dockerfile b/cmd/gitmirror/Dockerfile
index e66783f..82cbefd 100644
--- a/cmd/gitmirror/Dockerfile
+++ b/cmd/gitmirror/Dockerfile
@@ -2,11 +2,10 @@
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
-FROM golang:1.12 AS build
+FROM golang:1.14 AS build
LABEL maintainer "golang-dev@googlegroups.com"
ENV GO111MODULE=on
-ENV GOPROXY=https://proxy.golang.org
RUN mkdir /gocache
ENV GOCACHE /gocache
