bump to go 1.12.4

Signed-off-by: Andrew Hsu <andrewhsu@docker.com>

Makefile

@@ -5,7 +5,7 @@ VERSION?=0.0.0-dev
 DOCKER_GITCOMMIT:=abcdefg
 ARCH=$(shell uname -m)
 STATIC_VERSION=$(shell static/gen-static-ver $(ENGINE_DIR) $(VERSION))
-GO_VERSION:=1.11.5
+GO_VERSION:=1.12.4
 DEFAULT_PRODUCT_LICENSE:=Community Engine
 PLATFORM=Docker Engine - Community
 BUILDTIME=$(shell date -u -d "@$${SOURCE_DATE_EPOCH:-$$(date +%s)}" --rfc-3339 ns 2> /dev/null | sed -e 's/ /T/')

deb/Makefile

@@ -8,7 +8,7 @@ GITCOMMIT?=$(shell cd $(CLI_DIR) && git rev-parse --short HEAD)
 VERSION?=0.0.0-dev
 STATIC_VERSION=$(shell ../static/gen-static-ver $(ENGINE_DIR) $(VERSION))
 GO_BASE_IMAGE=golang
-GO_VERSION:=1.11.5
+GO_VERSION:=1.12.4
 GO_IMAGE=$(GO_BASE_IMAGE):$(GO_VERSION)
 DEB_VERSION=$(shell ./gen-deb-ver $(CLI_DIR) "$(VERSION)")
 CHOWN:=docker run --rm -v $(CURDIR):/v -w /v alpine chown

image/Makefile

@@ -3,7 +3,7 @@ ENGINE_DIR:=$(CURDIR)/../../engine
 CLI_DIR:=$(CURDIR)/../../cli
 VERSION?=0.0.0-dev
 GO_BASE_IMAGE=golang
-GO_VERSION:=1.11.5
+GO_VERSION:=1.12.4
 ENGINE_GO_IMAGE=$(GO_BASE_IMAGE):$(GO_VERSION)
 STATIC_VERSION=$(shell ../static/gen-static-ver $(ENGINE_DIR) $(VERSION))
 DOCKER_HUB_ORG?=dockereng

rpm/Makefile

@@ -7,7 +7,7 @@ GITCOMMIT=$(shell cd $(ENGINE_DIR) && git rev-parse --short HEAD)
 VERSION?=0.0.0-dev
 STATIC_VERSION=$(shell ../static/gen-static-ver $(ENGINE_DIR) $(VERSION))
 GO_BASE_IMAGE=golang
-GO_VERSION:=1.11.5
+GO_VERSION:=1.12.4
 GO_IMAGE?=$(GO_BASE_IMAGE):$(GO_VERSION)
 GEN_RPM_VER=$(shell ./gen-rpm-ver $(CLI_DIR) $(VERSION))
 CHOWN=docker run --rm -i -v $(CURDIR):/v -w /v alpine chown