Merge component 'packaging' from git@github.com:docker/docker-ce-packaging 19.03

Author: GordonTheTurtle

components/packaging/common.mk

@@ -2,7 +2,7 @@ ARCH=$(shell uname -m)
 BUILDTIME=$(shell date -u -d "@$${SOURCE_DATE_EPOCH:-$$(date +%s)}" --rfc-3339 ns 2> /dev/null | sed -e 's/ /T/')
 DEFAULT_PRODUCT_LICENSE:=Community Engine
 DOCKER_GITCOMMIT:=abcdefg
-GO_VERSION:=1.12.17
+GO_VERSION:=1.13.10
 PLATFORM=Docker Engine - Community
 SHELL:=/bin/bash
 VERSION?=0.0.0-dev

components/packaging/plugins/buildx.installer

@@ -21,7 +21,7 @@ build() {
         # TODO: unmark `-tp` when no longer a technical preview
         LDFLAGS="-X ${PKG}/version.Version=$(git describe --match 'v[0-9]*' --always --tags)-tp-docker -X ${PKG}/version.Revision=$(git rev-parse HEAD) -X ${PKG}/version.Package=${PKG} -X main.experimental=1"
         set -x
-        go build -o bin/docker-buildx -ldflags "${LDFLAGS}" ./cmd/buildx
+        GOFLAGS=-mod=vendor go build -o bin/docker-buildx -ldflags "${LDFLAGS}" ./cmd/buildx
     )
 }