Merge branch 'preview' into 180-interaktive-jobs-bash-l

Dockerfile

doc.zih.tu-dresden.de/README.md

doc.zih.tu-dresden.de/docs/contrib/content_rules.md

doc.zih.tu-dresden.de/docs/contrib/howto_contribute.md

...h.tu-dresden.de/docs/contrib/misc/create_gitlab_issue.gif

...zih.tu-dresden.de/docs/software/virtual_machines_tools.md

doc.zih.tu-dresden.de/requirements.txt

doc.zih.tu-dresden.de/util/check-bash-syntax.sh