Include a commit ref in deployment, but skip deployment if it is the only change

[curiousdannii]

I'd like to be able to include a version number or commit ref in the deployment, but to skip deployment if it is the only change. Anyone have any ideas of how that could be done?

Ignoring a file for checking if anything has changed would probably suffice, but even then there's a slight chance my index.html might change and none of the JS. Usually the JS would change too so it's probably not a real issue. It would be an acceptable tradeoff for me.