Use `set -eux` in all .sh files in tests

[janpio]

-x makes sure that commands are output before executing, that helps debug things generally.

Unless there is a reason not to of course.

[janpio]

PR "only" updated test.sh, might also be relevant for others.

[Jolg42]

Note that we might need to do the following around secrets

# disable printing with +x and return as before just after
set +x
echo "mysecre" > ~/.someprivatefile
set -x

set -x enables a mode of the shell where all executed commands are printed to the terminal. In your case it's clearly used for debugging, which is a typical use case for set -x: printing every command as it is executed may help you to visualize the control flow of the script if it is not functioning as expected.
set +x disables it.

[mizoz]

Hi! I'd love to contribute. Could you assign this issue to me? Happy to get started right away.