  * check test test-tikz when understood what TikZ needs in build env
  * check test plantuml when package plantuml becomes stable
    <https://bugs.debian.org/1039999>
    <https://bugs.debian.org/1034000>
  * check test test-mermaid when needed project is in Debian:
    * mermaid
      <https://bugs.debian.org/914889>
  * check test test-cetz when needed projects are in Debian:
    * typst
      <https://bugs.debian.org/1060888>
    * CeTZ
      <https://cetz-package.github.io/>
