chore: remove dnf cache and unused files from built image

[p5]

We should remove dnf cached files from the image before publishing it.
Also we don't need to include files like the devcontainer config or action.yml in the image, so only including the necessary files.

[noelmiller]

entrypoint.sh also needs to be copied over. I'm starting to think saving space on the action.yml, LICENSE file, README.md, and Containerfile isn't worth the hassle of continuing to add files to the list of things copied into the container.

@bsherman thoughts?

[p5]

entrypoint.sh also needs to be copied over. I'm starting to think saving space on the action.yml, LICENSE file, README.md, and Containerfile isn't worth the hassle of continuing to add files to the list of things copied into the container.

Have switched to a .dockerignore instead. That way, we are including files by default, instead of the previous way of excluding them by default.

[p5]

🤦 I cancelled the builds in the wrong tab. Will rerun them.
Sorry