switch to hashicorp docker mirror

.circleci/config.yml

@@ -6,7 +6,7 @@ orbs:
 executors:
   go:
     docker:
-      - image: circleci/golang:1.15
+      - image: docker.mirror.hashicorp.services/circleci/golang:1.15
     environment:
       CONSUL_VERSION: 1.7.2
       GOMAXPROCS: 4

Dockerfile

@@ -7,7 +7,7 @@
 # the officially-released binary from releases.hashicorp.com and are
 # built by the (closed-source) official release process.
 
-FROM golang:alpine
+FROM docker.mirror.hashicorp.services/golang:alpine
 LABEL maintainer="HashiCorp Terraform Team <terraform@hashicorp.com>"
 
 RUN apk add --no-cache git bash openssh