Replacing docker images with ghcr images (#1022)

[yashgiri]

Checklist

• The title of this PR would make a good line in Acorn's Release Note's Changelog
• The title of this PR ends with a link to the main issue being address in paranthesis, like: This is a title (#1216). Here's an example
• All relevant issues are referenced in the PR description. NOTE: don't use GitHub keyworkds that auto-close issues
• Commits follow contributing guidance
• Automated tests added to cover the changes. If tests couldn't be added, an explanation is provided in the Verification and Testing section
• Changes to user-facing functionality, API, CLI, and upgrade impacts are clearly called out in PR description
• PR has at least two approvals before merging (or a reasonable exception, like it's just a docs change)

This PR replaces use of aws ecr images to ghcr images.
Relevant tests have been modified.
Agreed with Craig on the idea that ghcr token expiring is fine.

[yashgiri]

Hi @tylerslaton I have updated those entries. Now all images that i could find are in ghcr.

[g-linville]

This line is in this file:

FROM nginx as static

And I think this is referring to the nginx:latest image in Docker Hub, since there isn't another FROM statement with the nginx alias given to it. So that image should be changed as well.

[tylerslaton]

Yep, great point @g-linville.