Special requirements for DietPi node-red installations

[lscarneiro]

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Proposed changes

I wasted several hours investigating the Error: getaddrinfo -3008 and couldn't solve it with any of the solutions proposed on this repo's issues nor on the dependency (mdns repo)[https://github.com/agnat/node_mdns].

In the end, it boiled down to DietP's minimalistic approach to default packages that don't even provide avahi-daemon out of the box (as you need to install it with dietpi-software) and looks like this wasn't enough for this node to work, I needed an extra prerequisite lib: libnss-mdns.

I didn't try uninstalling libavahi-compat-libdnssd-dev or libudev-dev to check if those are not needed for DietPi installations, but what solved in my case was installing this extra package.

I hope it helps someone in the future

Checklist

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the forum/slack team.
• I have run grunt to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality

[linux-foundation-easycla]

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