Fail to build - Has to incorrect python package name while installing through apt

Dear Marius,

in ./metasploit/Dockerfile you state:

RUN apt install -y curl apt-utils nmap **python** ruby ruby-dev postgresql 

which causes an issue while building the last stage.

You can update using python3
RUN apt install -y curl apt-utils nmap **python3** ruby ruby-dev postgresql 

This will run like a charm...

Hope this helps,

T.
