feat: motd

The idea here is to use update-motd to pull a simple message from https://eic.github.io/motd, which is shown on interactive logins into the eic-shell container. The message would be dynamic, but a cached version at ~/.eic-news would be shown while a background process pulls a new version. Each news run of a container would not show the latest message, but the next run will. Explictly running eic-news would be equivalent to running motd and showing the latest version as well.

assigned to @wdconinc

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• 34350c30 - feat: motd

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• 43a8139c - feat: motd

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• 92146c80 - feat: add eic-news

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• 2737bf9b - Revert "feat: motd"

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