Update CI images workflow to build and push Presto coordinator

[Avinash-Raj]

No description provided.

[bdice]

I think we should split the build and test phases into separate workflows.

The logic for "maybe build, unless I supplied an image name" is not very intuitive.

I recommend that we make ci-images-manual.yml and ci-images-nightly.yml call the build phase, and then they will get an output for the built image names. Then call the test phase.

If you want to add the ability to test with an image name, we can make a manual dispatch for only the test phase.

I recommend that we break this up into a few separate pieces:

• Add the Presto coordinator build & merge steps
• Split the workflows into build & test, with a manual dispatch trigger for the test phase
• Add the integration test jobs to the test phase