Update docker workflows

[froggleston]

This PR updates the sandpaper GHA workflows to new versions which:

• are smaller and cleaner, using new carpentries/actions instead
• have improved triggers and checks

[github-actions]

ℹ️ Modified Workflows

This pull request contains modified workflow files and no preview will be created.

Workflow files modified:

• .github/workflows/docker_apply_cache.yaml
• .github/workflows/docker_build_deploy.yaml
• .github/workflows/docker_pr_receive.yaml
• .github/workflows/pr-comment.yaml
• .github/workflows/sandpaper-version.txt
• .github/workflows/update-cache.yaml

If this is not from a trusted source, please inspect the changes for any malicious content.

[Bisaloo]

Should this pin a specific commit hash? My understanding is that it was forked in the carpentries to ensure no malicious updates could be pushed to this action used across all Carpentries organizations.

[froggleston]

We could! I would definitely prefer that than managing our own fork of third party actions.

[froggleston]

@Bisaloo I've updated these workflows to fix a range of recent issues, but they currently require a test branch of the carpentries/actions. As a result if everything now works as it should, then we'll need to do another update to use the main actions once my changes have been tested and merged in.