Migrate Image Host to GHCR (WIP)

[daniel-spray]

What does this PR do?

See title

Where should the reviewer start?

deploy.yml

How should this be manually tested?

Forked repo, ran actions on master branch there, created release. Pull release and deployed release using helm.

Any background context you want to provide?

Nope

What picture best describes this PR (optional but encouraged)?

n/a

What are the relevant Github Issues?

n/a

Developer Done List

• [x] Tests Added/Updated
• [x] Updated README.md
• [x] Verified backward compatible
• [x] Verified database migrations will not be catastrophic
• [x] Considered Security, Availability and Confidentiality

For the Reviewer:

By approving this PR, the reviewer acknowledges that they have checked all items in this done list.

Reviewer/Approval Done List

• [ ] Tests Pass Locally
• [ ] CI Build Passes
• [ ] Verified README.md is updated
• [ ] Verified changes are backward compatible
• [ ] Reviewed impact to Security, Availability and Confidentiality (if issue found, add comments and request changes)