Add public keys and source tarball creation script

[ewanas]

OP#1144

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Code Review Checklist

• Description accurately reflects what changes are being made.
• Description explains why the changes are being made (or references an issue containing one).
• The PR appropriately sized.
• New code has enough tests.
• New code has enough documentation to answer "how do I use it?" and "what does it do?".
• Existing documentation is up-to-date, if impacted.

[meejah]

Looks good; see inline suggestion.

Also might be worth putting the signing command in, too (maybe one for each of you) to copy-paste at least.

[meejah]

hmm, not sure what happened to the inline comment .. was essentially just "maybe git archive works for the tarball" but per other discussion, that doesn't cover submodules.