Release builder for PCDs

[SteveLLamb]

Set up a workflow for public repos to auto generate a PCD PR/release:

• User sets to private repo' release tag for cd - validate proper meta
• Option to point to pdf/zip for legacy word docs
• User defined PCD start/end date
• Option for details
• Notices 1 week, 1 day prior to end date.
• Auto gen PR for back to non-PCD repo.

[ERyan71258]

• Include option to extend end date.
• Allow the ability to add multiple alert recipients. Always include the VP Standards, Director of Standards, the TC Chair, and me. Perhaps you, as well?