Change Baseimage back to Node-Baseimage for better maintainability

[snoopotic]

Also bumping to new Version 3.0.2 and fixing an issue if you try to build the image on an host with ipV6 enabled.

[sampaiodiego]

Sorry for taking so long to take a look on this..

I tried building this one and got the following error:

Sending build context to Docker daemon  3.584kB
Step 1/14 : FROM node:14.12-slim
manifest for node:14.12-slim not found: manifest unknown: manifest unknown

not sure it was available at the time you opened the PR, but right now I got this.

[snoopotic]

Oh my. I am very sorry wasting your time. I somehow rotated the node version numbers in the base image tag. I see next step is to implement an automated build.test :)

It should work now.

[sampaiodiego]

lol I didn't realised the version was just inverted :P

[sampaiodiego]

I'm afraid switching to node:12.14-slim we'll end up having issues as we had before since this version is not on supported tags anymore (only 12.16 currently is https://github.com/docker-library/official-images/blob/master/library/node), please look on previous discussions at:

#57 (comment)
https://travis-ci.org/docker-library/official-images/builds/449066913

wdyt @geekgonecrazy ?

Maybe it is safe to keep using debian

[snoopotic]

Well, node:12.14-slim is a debian based image.
Well, you could switch to 12.16-slim as newest 12 but I just followed the notes on the releasenotes (https://github.com/RocketChat/Rocket.Chat/releases) and they state node 12.14. I assume this is a tested node version... :)