Makefile: Set NodeJS version to use in var

Add new variable in the Makefile to specify the used NodeJS version so
it can be referenced wherever else in the file rather than hard-coding
it.

Having in to a variable makes more visible and quicker to find out which
NodeJS version the project uses.

Change-Id: I87abc3b3e5489407638618f8199aec7c2f40ca9f

Makefile

@@ -2,6 +2,7 @@ GO_VERSION ?= 1.17.5
 GOOS ?= linux
 GOARCH ?= amd64
 GOPATH ?= $(shell go env GOPATH)
+NODE_VERSION ?= 16.11.1
 COMPOSE_PROJECT_NAME := ${TAG}-$(shell git rev-parse --abbrev-ref HEAD)
 BRANCH_NAME ?= $(shell git rev-parse --abbrev-ref HEAD | sed "s!/!-!g")
 ifeq (${BRANCH_NAME},main)
@@ -151,7 +152,7 @@ storagenode-console:
 		-w /go/src/storj.io/storj/web/storagenode \
 		-e HOME=/tmp \
 		-u $(shell id -u):$(shell id -g) \
-		node:16.11.1 \
+		node:${NODE_VERSION} \
 	  /bin/bash -c "npm ci && npm run build"
 	# embed web assets into go
 	go-bindata -prefix web/storagenode/ -fs -o storagenode/console/consoleassets/bindata.resource.go -pkg consoleassets web/storagenode/dist/... web/storagenode/static/...
@@ -169,7 +170,7 @@ multinode-console:
 		-w /go/src/storj.io/storj/web/multinode \
 		-e HOME=/tmp \
 		-u $(shell id -u):$(shell id -g) \
-		node:16.11.1 \
+		node:${NODE_VERSION} \
 	  /bin/bash -c "npm ci && npm run build"
 	# embed web assets into go
 	go-bindata -prefix web/multinode/ -fs -o multinode/console/consoleassets/bindata.resource.go -pkg consoleassets web/multinode/dist/... web/multinode/static/...
@@ -185,7 +186,7 @@ satellite-admin-ui:
 		-w /go/src/storj.io/storj/satellite/admin/ui \
 		-e HOME=/tmp \
 		-u $(shell id -u):$(shell id -g) \
-		node:16.11.1 \
+		node:${NODE_VERSION} \
 	  /bin/bash -c "npm ci && npm run build && cp -r build/* assets"
 
 .PHONY: satellite-wasm