Deb packages: Failed check in postinst causes configure step to fail

[ghost]

The deb packages run intelmqctl check in postinst:

intelmq/debian/intelmq.postinst

Line 16 in 24f2355

runuser -u intelmq -- /usr/bin/intelmqctl -q check --no-connections

This is fine and reports configuration errors to the administrator. However, a non-zero exit code can happen and this will cause the configure step to fail which has implications on the installation of the IntelMQ and other dependent packages. In upgrades to 2.3.0 this will cause that the Manager and API won't work.

We should therefore ignore the exit code of intelmqctl check in the postinst. For the intelmqctl upgrade-config call, it's OK to fail for non-zero exit codes, as that should not happen and would mean a bug in IntelMQ.