> The problem with this approach is that is not portable. What if I am developing using more than one computers where in each computer my user has different ID?

Make the build script use local $USERID and $GROUPID as args during the build process.

In docker-compose.yml (or, if using docker directly, using --build-arg):

    build:
      context: ./build
      args:
        USERID: ${USERID}
        GROUPID: ${GROUPID}

So you're passing the local uid and gid as variables to the build process.(1)

In build/Dockerfile:

  FROM image:tag
  WORKDIR "/application"
  ARG USERID
  ARG GROUPID

  RUN if [ ${USERID:-0} -ne 0 ] && [ ${GROUPID:-0} -ne 0 ]; then userdel -f www-data ;fi \
    && if getent group ${GROUPID} ; then groupdel www-data; fi \
    && groupadd -g ${GROUPID} www-data && useradd -m -l -u ${USERID} -g www-data www-data -s /bin/bash \

(1) $USERID and $USERID might not be available as an environment variable on your system. To do so, place this under .bashrc:

  export USERID=$(id -u)
  export GROUPID=$(id -g)