feat: Publish to GHCR

[USA-RedDragon]

Context

• Release the Docker images to the GitHub Container repository which is free and isn't subject to the same rate limiting as Docker Hub
• Related: feat: chart: allow specifying imagePullSecrets #354

Choices

• I added jobs in parallel with the Docker Hub release jobs to push to GHCR
• I added a workflow to publish developer images to GHCR as well

Test instructions

1. Just ran the workflows in my fork, resulting in: https://github.com/USA-RedDragon/palworld-server-docker/pkgs/container/palworld-server-docker

Checklist before requesting a review

• I have performed a self-review of my code
• I've added documentation about this change to the README.
• I've not introduced breaking changes.

[Twinki14]

Instead of brand new workflows, we should keep docker image publishing all in the same workflow

Ideally this would be building the image then pushing to both registries in the same workflow job

This will keep our workflow logic organized and efficient

[USA-RedDragon]

Question, are you referring to the extra ghcr.yaml workflow for the GHCR Development Builds? Or do you mean in release.yaml I should be pushing to both GHCR and Docker Hub in the same job? (Or both?).

Edit: did both

Thanks!

[Twinki14]

Perfect! Could not have done it better myself