Image attestation

[leighmcculloch]

The images published by this repo should have attestations registered into sigstore so that they can be verified and linked back to the code that resulted in their build.

[github-actions]

This issue is stale because it has been open for 30 days with no activity. It will be closed in 30 days unless the stale label is removed.

[github-actions]

This issue is stale because it has been open for 30 days with no activity. It will be closed in 30 days unless the stale label is removed.

[github-actions]

This issue is stale because it has been open for 30 days with no activity. It will be closed in 30 days unless the stale label is removed.

[github-actions]

This issue is stale because it has been open for 30 days with no activity. It will be closed in 30 days unless the stale label is removed.