Initial code commit

[webbnh]

This is the inaugural commit of the file-relay code, infrastructure, and GitHub setup. (However, I had to submit the GitHub Actions configuration itself separately, as it doesn't use the contents of a PR to test that PR, which means that the config has to be submitted ahead of the rest.)

After much sweat and gnashing of teeth, I believe I have GitHub Actions running a CI which accepts this change (but, it depends on stuff in this change, so it currently rejects main...).

While this submission is "functionally complete" (i.e., the interfaces seem to work, as do the unit tests), this is not the final form. There are several items which we will probably want before Pbench can make full use of this:

• The hash algorithm for resource names might need to be changed or made configurable
• The underlying web server may be changed from the reference one to Gunicorn or other
• The web server should be made able to accept SSL connections
• The utility needs to be packaged, either as a Python package or a container (or both)
• Figure out what the server status response should contain -- currently, it provides a list of the available files, which undermines the "ya gotta know it's there" story, but it's handy for testing and debugging.

But, what is here is a reasonable start.

[portante]

Seems like a reasonable initial commit.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@7c316e3). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #2   +/-   ##
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  Coverage        ?   98.52%           
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  Files           ?        2           
  Lines           ?      543           
  Branches        ?        0           
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  Hits            ?      535           
  Misses          ?        8           
  Partials        ?        0           

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[webbnh]

❗ No coverage uploaded for pull request base (main@7c316e3). Click here to learn what that means.
Patch has no changes to coverable lines.

Sent feedback to the Codecov folks and also replied in codecov/feedback#8 .

[dbutenhof]

This looks like basically the same code I reviewed before. I don't think it's useful to Pbench in the current form (especially, insufficient information to define a dataset before pulling a large amount of data); but if it makes you feel better to submit a baseline for reference, go for it.