io: Update Dockerfile

[dubek]

Build Io interpreter and packages from source in latest Ubuntu.

The interpreter looks for packages under eerie in the current directory, so create the symlink in the Makefile that is "building" each step.

Now the Regex package no longer prints a message when loaded, so no need for the special treatment in run.

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• Commits are well written and well organized.
• Commits for a specific implementation should be prefixed with
  the implementation name.
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