feat: rootless docker container

[jvirgovic]

As per OWASP's Docker Security Cheat Sheet, it is recommended to set a user instead of running the container as root.

virgo@lenovo:~$ docker ps -a
CONTAINER ID   IMAGE                 COMMAND       CREATED              STATUS              PORTS     NAMES
ee568549229f   cyclonedx-py:latest   "/bin/bash"   About a minute ago   Up About a minute             nifty_swirles
virgo@lenovo:~$ docker exec -it ee568549229f sh -c "id"
uid=1000(cyclonedx) gid=1000(cyclonedx) groups=1000(cyclonedx)

⬆️ Now the container is running as a standard user.

[jkowalleck]

thank you so much for this improvement!

Will merge it early next week 🚀