add configuration to use react-nginx sample with Docker Dev Environments feature (#269)

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

react-nginx/Dockerfile

@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1.4
+
 # 1. For build React app
 FROM node:lts AS development
 
@@ -22,6 +24,22 @@ FROM development AS build
 
 RUN npm run build
 
+
+FROM development as dev-envs
+RUN <<EOF
+apt-get update
+apt-get install -y --no-install-recommends git
+EOF
+
+RUN <<EOF
+useradd -s /bin/bash -m vscode
+groupadd docker
+usermod -aG docker vscode
+EOF
+# install Docker tools (cli, buildx, compose)
+COPY --from=gloursdocker/docker / /
+CMD [ "npm", "start" ]
+
 # 2. For Nginx setup
 FROM nginx:alpine