add tex to pdf convert

[christian-korneck]

a report pdf file gets created and uploaded alongside the tex file
Fixes #8

[sir-ragna]

I tested it and it works. 👍

There does seem to be a significant size increase. From 196MB to 3.09GB. For automatic deployments that regularly rebuild because you want the latest nmap-scripts, I think this might start to add up.

On one hand I really want this in the repo and on the other hand I feel like it might not be suitable as a default. Here's an idea. What about putting this in a separate container specifically building the reports. Create a separate Dockerfile that can be build and run from the same Makefile. The advantages would be that:

• building it becomes optional;
• rebuilds can be optimized so more layers are shared with previous builds.
• It can also include xsltproc and the commands to conver the xml to html reports