build: publish docker image

[holic]

This should publish an image for every main commit, tagged with latest (for main branch), branch name, and sha. You can also manually kick off an image build/push via workflow trigger.

https://github.com/orgs/latticexyz/packages

Some improvements for later:

• always build Docker image on every commit, only push on the branches we want to release from

• add version tag, but requires Changesets allowing is to have one git tag per version rather than one per package+version: Allow disabling tags or creating single tag changesets/changesets#589

  possibly fixed with a regex tag! will need to release before we can tell if this works

[changeset-bot]

⚠️ No Changeset found

Latest commit: 097352b

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[holic]

it works! still not sure why the sha tag isn't working but I am hoping it'll work once this lands