Add R and apt packages to container image

[korlaxxalrok]

Description

Add some necessary packages

Changelog

• Dockerfile: add packages

[nmdefries]

Everything seems to install correctly, but sendmail hangs if I try to call it. Is there additional configuration we need to do for sendmail?

[korlaxxalrok]

Ah, good catch. I'll check.

[korlaxxalrok]

@nmdefries I think this will work.

We'll add ssmtp and a simple config to the container that will relay mail to the container host.

We'll have to run the container with the host networking option (--net=host) so that we have simple access to the host via localhost, and then the host will relay again through a specific server based on the email domain of the recipient (automagically configured as best I can tell, but this appears to be the mechanism on our VMs owned by CMU). I've tested this on a bigchunk with success to both a CMU and Google account.

This will also require a simple change to the postfix config on the container host.

It will be hard to test this locally, but if you have access to a bigchunk (or potentially other system that is part of the delphi.cmu.edu domain) you can build the container there and it should work 🤞

This introduces another dependency on the container host, but later on we can find a way to use an external mail relay. That would be one of the best ways to decouple.

[nmdefries]

Looks good. I'm not able to verify that sendmail works (as noted above, doesn't work on any old machine) but it no longer hangs.