Using golang:1.13.9-alpine as base container for the gocover-cobertura tool (it requires Golang to be installed)

Change-Id: Ie09642e350c579b4f759da4adad0ce766ec3673d
diff --git a/Makefile b/Makefile
index db3ca93..87a15f8 100644
--- a/Makefile
+++ b/Makefile
@@ -79,6 +79,7 @@
 
 gocover-cobertura:
 	${DOCKER} build ${DOCKER_BUILD_ARGS} \
+	--build-arg GOLANG_VERSION=${GOLANG_VERSION} \
 	--build-arg GOCOVER_COBERTURA_VERSION=${GOCOVER_COBERTURA_VERSION} \
 	-t ${IMAGENAME}:${VERSION}-gocover-cobertura \
 	-t ${IMAGENAME}:latest-gocover-cobertura \
@@ -133,4 +134,3 @@
 	${DOCKER} push ${IMAGENAME}:${VERSION}-hadolint
 	${DOCKER} push ${IMAGENAME}:${VERSION}-protoc
 	${DOCKER} push ${IMAGENAME}:${VERSION}-python
-