VOL-630 - update documentation with default creds and doc ssh key support

Change-Id: I96ec086f55d7861068ee59eb63fef7ff79472100
diff --git a/Makefile b/Makefile
index 6e61121..5a67727 100644
--- a/Makefile
+++ b/Makefile
@@ -289,6 +289,13 @@
 	docker build $(DOCKER_BUILD_ARGS) -t ${REGISTRY}${REPOSITORY}voltha-cli:${TAG} -f docker/Dockerfile.cli_d .
 endif
 
+custom_cli: cli
+ifeq ($(CUSTOM_CLI_LABEL),)
+	docker build ${DOCKER_BUILD_ARGS} -t ${REGISTRY}${REPOSITORY}voltha-cli-custom:${TAG} -f docker/Dockerfile.cli_custom .
+else
+	docker build ${DOCKER_BUILD_ARGS} -t ${REGISTRY}${REPOSITORY}voltha-cli${CUSTOM_CLI_LABEL}:${TAG} -f docker/Dockerfile.cli_custom .
+endif
+
 portainer:
 ifneq ($(VOLTHA_BUILD),docker)
 	REGISTRY=${REGISTRY} REPOSITORY=${REPOSITORY} TAG=${TAG} portainer/buildPortainer.sh