Cleanup PDF build job on Read the Docs

.readthedocs.yaml

@@ -35,18 +35,16 @@ build:
       - git fetch --unshallow
     # Altered PDF build and upload job, attributed to
     # https://stackoverflow.com/a/76992101/14001839
+    # This also runs on PR builds, but does not upload the PDF
     post_build:
       - mkdir --parents $READTHEDOCS_OUTPUT/pdf/
       # Generate LaTeX files in docs/build/ and doctrees in docs/_build/doctrees, skipping notebooks
       - python -m sphinx -T -E -b latex -d docs/_build/doctrees -D language=en docs docs/build/
       - cd docs/build/ && cat latexmkrc
       # Map non-zero exit codes to zero
       - cd docs/build/ && latexmk -r latexmkrc -pdf -f -dvi- -ps- -jobname=pybamm -interaction=nonstopmode || true
-      # Check if pybamm.pdf exists
       - test -f docs/build/pybamm.pdf && echo "pybamm.pdf exists. Copying source file to $READTHEDOCS_OUTPUT/pdf/."
-      - ls $READTHEDOCS_OUTPUT/pdf/
       - cp "docs/build/pybamm.pdf" $READTHEDOCS_OUTPUT/pdf/
-      - ls $READTHEDOCS_OUTPUT/pdf/
 
 # Optionally declare the Python requirements required to build your docs
 python: