⚗️ ensure the latex docs can be built on RtD as well (to be reverted)

Signed-off-by: burgholzer <burgholzer@me.com>

.readthedocs.yaml

@@ -31,6 +31,8 @@ build:
     build:
       html:
         - uv run --frozen --no-dev --group docs -m sphinx -T -b html -d docs/_build/doctrees -D language=en docs $READTHEDOCS_OUTPUT/html
+        - uv run --frozen --no-dev --group docs -m sphinx -T -b latex -d docs/_build/doctrees -D language=en docs docs/_build/latex
+        - cd docs/_build/latex && latexmk -pdf -f -dvi- -ps- -interaction=nonstopmode -jobname=$READTHEDOCS_PROJECT
       htmlzip:
         - uv run --frozen --no-dev --group docs -m sphinx -T -b dirhtml -d docs/_build/doctrees -D language=en docs docs/_build/dirhtml
         - mkdir -p $READTHEDOCS_OUTPUT/htmlzip