Can't start with bind-addr: localhost in config

[mrhackcz]

Hi,
I’d like to ask whether it’s really necessary to enforce the new check introduced in version 4.0.9, which causes Dkron to fail startup with the following message:

Error: failed to parse advertise address (, 127.0.0.1:8946, 8946, false): defaulting advertise to localhost is unsafe, please set advertise manually

From my perspective, this behavior is too strict. I don’t think binding to localhost should be treated as unsafe — especially for a standalone setup, where listening on localhost is actually the desired and secure configuration.

This mainly causes issues on Debian/Ubuntu installations from the repository, where Dkron runs as a systemd service and defaults to a localhost bind. If I want Dkron to listen only on localhost, I must now modify the systemd unit file to bypass this check, which complicates otherwise simple deployments.

Would it be possible to either:

• downgrade this message from error to a warning, or
• remove the restriction entirely?

That would make local and single-node deployments work again without manual systemd modifications.

Thank you!

To Reproduce
Steps to reproduce the behavior:

bind-addr: "127.0.0.1:8946"

[mrhackcz]

@vcastellm what do you think ?