Update the publish.yml template

[sinsukehlab]

metadata-action

Why:

Closes #17

What's being changed:

• Bump actions/checkout to v3 (already done in 2459f17)
• Add a docker/metadata-action@v4 step
• Add a docker/login-action@v2 step
• Bump docker/build-push-action to v3

Check off the following:

• [ ] For workflow changes, I have verified the Actions workflows function as expected.
• [ ] For content changes, I have reviewed the style guide.

[chadfawcett]

@heiskr can you give this a review?