add new Doxygen build script

1 job for master in 2 minutes and 1 second (queued for 4 seconds)
Status Job ID Name Coverage
  Test
failed #179
pages

00:02:01

 
Name Stage Failure
failed
pages Test
Downloading artifacts
Running before_script and script
$ mkdir -p docs
$ cd Doku/Doxygen/
$ apt install doxygen texlive-base texlive-latex-extra texlive-fonts-extra texlive-fonts-recommended python3-pip
/bin/sh: eval: line 90: apt: not found
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 127