Consider making Docker image IDs more visible in the logs

[StevenMaude]

In some debugging cases, knowing which Docker images were used for a specific project run is very useful.

I'm trying to help a user who is having problems with their project, but it's tricky to try and reproduce a "good" state as seen on previous GitHub Actions runs.

The metadata logs have this information, but:

• in GitHub Actions, we only see the output log, and can't access the metadata logs
• if a run is stopped (either by a user interactively locally when testing on their computer, or by a GitHub Actions timeout), I don't believe we would have the metadata logs anyway (but I could be wrong)