Hi i am using awsx to push images to ecr like so

const repo = new awsx.ecr.Repository("registry");
const image = repo.buildAndPushImage('/path/to/image');

I notice each time I run pulumi up the image is getting built and pushed (hits the cache so the time delay isn't too bad but still unnecessary to run these steps every time). Is there a way to skip this altogether if the image directory has not changed? thanks