I'm not surprised by the big diff in the log file but am wondering about /dist/main.js. This is a generated file, or? Is it intentionally committed?

Yes, it is autogenerated by yarn build which converts the latest JS code in action to transpiled code into the bundle /dist.main.js for node to understand and run in Pull requests.

The big diff is because of the all the new dependencies added.

I also minified the bundle now, so we don't have a huge difference.