Improove the creation of vscode user

To create the vscode user, the provide_user.sh script is used. With this script the comand line appearance is improved with colors and branch informations

.devcontainer/Dockerfile

@@ -6,18 +6,20 @@ FROM centos:7
 # Allow customization of build user ID and name
 ARG VSCODE_USER=vscode
 ARG VSCODE_USER_UID=1000
+ARG VSCODE_GID=${VSCODE_USER_UID}
 
 ENV VSCODE_USER $VSCODE_USER
 ENV VSCODE_USER_UID $VSCODE_USER_UID
+ENV VSCODE_GID=${VSCODE_USER_UID}
+
+COPY assets/provide-user.sh /docker/
+RUN sh /docker/provide-user.sh ${VSCODE_USER} ${VSCODE_USER_UID} ${VSCODE_GID}
 
 RUN echo "include_only=.garr.it,.cern.ch" >> /etc/yum/pluginconf.d/fastestmirror.conf && \
       yum clean all && \
       yum install -y hostname epel-release && \
       yum -y update && \
       yum -y install which wget tar sudo file && \
-      echo '%wheel ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers && \
-      adduser --uid ${VSCODE_USER_UID} ${VSCODE_USER} && \
-      usermod -a -G wheel ${VSCODE_USER} && \
       yum clean all && \
       rm -rf /var/cache/yum
 

.devcontainer/assets/provide-user.sh

+#!/usr/bin/env bash
+
+# Copyright 2018-2022 Istituto Nazionale di Fisica Nucleare
+# SPDX-License-Identifier: EUPL-1.2
+
+USERNAME=${1}
+USER_UID=${2}
+USER_GID=${3}
+
+set -e
+
+if [ "$(id -u)" -ne 0 ]; then
+    echo -e 'Script must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
+    exit 1
+fi
+
+groupadd --gid $USER_GID $USERNAME
+useradd --uid $USER_UID --gid $USER_GID -m $USERNAME
+
+yum install -y sudo
+echo $USERNAME ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/$USERNAME
+chmod 0440 /etc/sudoers.d/$USERNAME
+
+CODESPACES_BASH="$(cat \
+<<'EOF'
+
+# Codespaces bash prompt theme
+__bash_prompt() {
+    local userpart='`export XIT=$? \
+        && [ ! -z "${GITHUB_USER}" ] && echo -n "\[\033[0;32m\]@${GITHUB_USER} " || echo -n "\[\033[0;32m\]\u " \
+        && [ "$XIT" -ne "0" ] && echo -n "\[\033[1;31m\]➜" || echo -n "\[\033[0m\]➜"`'
+    local gitbranch='`\
+        export BRANCH=$(git rev-parse --abbrev-ref HEAD 2>/dev/null); \
+        if [ "${BRANCH}" = "HEAD" ]; then \
+            export BRANCH=$(git describe --contains --all HEAD 2>/dev/null); \
+        fi; \
+        if [ "${BRANCH}" != "" ]; then \
+            echo -n "\[\033[0;36m\](\[\033[1;31m\]${BRANCH}" \
+            && if git ls-files --error-unmatch -m --directory --no-empty-directory -o --exclude-standard ":/*" > /dev/null 2>&1; then \
+                    echo -n " \[\033[1;33m\]✗"; \
+            fi \
+            && echo -n "\[\033[0;36m\]) "; \
+        fi`'
+    local lightblue='\[\033[1;34m\]'
+    local removecolor='\[\033[0m\]'
+    PS1="${userpart} ${lightblue}\w ${gitbranch}${removecolor}\$ "
+    unset -f __bash_prompt
+}
+__bash_prompt
+
+EOF
+)"
+
+USER_RC_PATH="/home/${USERNAME}"
+
+echo "${CODESPACES_BASH}" >> "${USER_RC_PATH}/.bashrc"
+chown ${USERNAME}:${USERNAME} "${USER_RC_PATH}/.bashrc"
+
+echo "Done!"