Pipeline is failing

The reason is unclear for: pdflatex: Command for 'pdflatex' gave return code 1

Tried

• Latexmk with and without -f (force mode)
• Sending output of pdlatex to < /dev/null (probably not correct, see d1686ae7)
• Removing subfloat figure (see c26b39c1)

Gave up and ignored it for now.