Pin Golang images to debian stretch variant

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 1310e39)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 1fd135703681a7000b36c380cc9a06e7816fb689
Component: packaging

Author: thaJeztah

components/packaging/deb/Makefile

@@ -7,7 +7,7 @@ VERSION?=0.0.0-dev
 STATIC_VERSION=$(shell ../static/gen-static-ver $(ENGINE_DIR) $(VERSION))
 GO_BASE_IMAGE=golang
 GO_VERSION:=1.12.6
-GO_IMAGE=$(GO_BASE_IMAGE):$(GO_VERSION)
+GO_IMAGE=$(GO_BASE_IMAGE):$(GO_VERSION)-stretch
 DEB_VERSION=$(shell ./gen-deb-ver $(CLI_DIR) "$(VERSION)")
 CHOWN:=docker run --rm -v $(CURDIR):/v -w /v alpine chown
 EPOCH?=5

components/packaging/image/Makefile

@@ -4,7 +4,7 @@ CLI_DIR:=$(CURDIR)/../../cli
 VERSION?=0.0.0-dev
 GO_BASE_IMAGE=golang
 GO_VERSION:=1.12.6
-ENGINE_GO_IMAGE=$(GO_BASE_IMAGE):$(GO_VERSION)
+ENGINE_GO_IMAGE=$(GO_BASE_IMAGE):$(GO_VERSION)-stretch
 STATIC_VERSION=$(shell ../static/gen-static-ver $(ENGINE_DIR) $(VERSION))
 DOCKER_HUB_ORG?=dockereng
 ARCH=$(shell uname -m)

components/packaging/rpm/Makefile

@@ -6,7 +6,7 @@ VERSION?=0.0.0-dev
 STATIC_VERSION=$(shell ../static/gen-static-ver $(ENGINE_DIR) $(VERSION))
 GO_BASE_IMAGE=golang
 GO_VERSION:=1.12.6
-GO_IMAGE?=$(GO_BASE_IMAGE):$(GO_VERSION)
+GO_IMAGE?=$(GO_BASE_IMAGE):$(GO_VERSION)-stretch
 GEN_RPM_VER=$(shell ./gen-rpm-ver $(CLI_DIR) $(VERSION))
 CHOWN=docker run --rm -i -v $(CURDIR):/v -w /v alpine chown