gitlab-ci: Add ghostscript for doxygen to run.

.gitlab-ci.yml

@@ -305,7 +305,7 @@ gen_doxy_html:
   script:
   - module purge
   - module load texlive/live2021-gcc-11.2.0
-  - PATH="$PATH:/sw/spack-levante/mambaforge-22.9.0-2-Linux-x86_64-kptncg/pkgs/graphviz-6.0.2-h99bc08f_0/bin"
+  - PATH="$PATH:/sw/spack-levante/mambaforge-22.9.0-2-Linux-x86_64-kptncg/pkgs/graphviz-6.0.2-h99bc08f_0/bin:/sw/spack-levante/mambaforge-4.13.0-1-Linux-x86_64-budobm/pkgs/ghostscript-9.54.0-h27087fc_2/bin"
   - make -C doc DOXYGEN=/home/k/k202069/opt/doxygen-1.12.0-x64-linux/bin/doxygen 2> >(tee doxy.err)
   artifacts:
     expire_in: 5min