fix: remove use of virtual in node-gyp multistage (#1034)

fix: remove use of virtual in node-gyp multistage

Author: SimenB

docs/BestPractices.md

@@ -173,7 +173,7 @@ And Here's a multistage build example
 FROM node:alpine as builder
 
 ## Install build toolchain, install node deps and compile native add-ons
-RUN apk add --no-cache --virtual .gyp python make g++
+RUN apk add --no-cache python make g++
 RUN npm install [ your npm dependencies here ]
 
 FROM node:alpine as app