Add entrypoint which auto detects proxy

[OhMyMndy]

if nmap host.docker.internal -Pn -p 3128 &>/dev/null; then
  export http_proxy=http://host.docker.internal:3128
  export HTTPS_PROXY="$http_proxy"
  export HTTP_PROXY="$http_proxy"
  echo "check_certificate = off" > ~/.wgetrc
  echo "--insecure" > ~/.curlrc

  echo 'Acquire::http::Proxy "$http_proxy/";' | sudo tee /etc/apt/apt.conf.d/proxy.conf
  echo 'Acquire::https::Proxy "$http_proxy/";' | sudo tee -a /etc/apt/apt.conf.d/proxy.conf

else
  rm -f ~/.wgetrc ~/.curlrc
  sudo rm -f /etc/apt/apt.conf.d/proxy.conf
fi