Move labels in Dockerfile higher (purely aesthetic)
Set DEBIAN_FRONTEND=noninteractive in Dockerfile, this has no effect now but there's no telling the future
Change trigger of SL CI because it requires write permissions to the repository, which is not enabled by default in forks, causing the workflow to fail all the time
Use docker with subcommands for clarity
Change trigger of Docker Image CI to only run on push to master
DEBIAN_FRONTEND=noninteractive
in Dockerfile, this has no effect now but there's no telling the future