Update Dockerfile

Signed-off-by: techopsmasters <163403479+techopsmasters@users.noreply.github.com>

react-java-mysql/frontend/Dockerfile

@@ -15,16 +15,12 @@ ENV PORT=3000
 CMD [ "npm", "start" ]
 
 FROM development AS dev-envs
-RUN <<EOF
-apt-get update
-apt-get install -y git
-EOF
-
-RUN <<EOF
-useradd -s /bin/bash -m vscode
-groupadd docker
+RUN apt update && \
+    apt install -y git
+
+RUN 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" ]