[w3c/manifest] Create main.yml (#902)

Closes #???

This change (choose one):

* [x] Breaks existing normative behavior (please add label "breaking")
* [x] Adds new normative requirements
* [x] Adds new normative recommendations or optional items
* [x] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [x] Is a "chore" (metadata, formatting, fixing warnings, etc).

Implementation commitment (delete if not making normative changes):

* [ ] Safari (link to issue)
* [ ] Chrome (link to issue)
* [ ] Firefox (link to issue)
* [ ] Edge (public signal)

Commit message:

(Fill in. If making normative changes, describe exactly what the behavioral
difference will be.)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/902

-- Commit Summary --

  * Create main.yml

-- File Changes --

    A .github/workflows/main.yml (33)

-- Patch Links --

https://github.com/w3c/manifest/pull/902.patch
https://github.com/w3c/manifest/pull/902.diff

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