add configuration to use vuejs sample with Docker Dev Environments feature (#253)

Signed-off-by: Guillaume Lours <guillaume.lours@docker.com>

vuejs/vuejs/Dockerfile

@@ -1,4 +1,5 @@
-FROM node:14.4.0-alpine
+# syntax=docker/dockerfile:1.4
+FROM --platform=$BUILDPLATFORM node:14.4.0-alpine AS development
 
 RUN mkdir /project
 WORKDIR /project
@@ -9,3 +10,18 @@ RUN yarn global add @vue/cli
 RUN yarn install
 ENV HOST=0.0.0.0
 CMD ["yarn", "run", "serve"]
+
+FROM development as dev-envs
+RUN <<EOF
+apk update
+apk add git
+EOF
+
+RUN <<EOF
+addgroup -S docker
+adduser -S --shell /bin/bash --ingroup docker vscode
+EOF
+# install Docker tools (cli, buildx, compose)
+COPY --from=gloursdocker/docker / /
+CMD ["yarn", "run", "serve"]
+