Upload every PNG/WebP under a local folder as a named Diffy custom snapshot.
Breakpoint is read from the PNG width; URL slug is derived from file name.
Then (I |we )*upload folder "([^"]*)" to diffy as "([^"]*)"
Example #1: Then upload folder "./screenshots/baseline" to diffy as "baseline"
Example #2: Then upload folder "./screenshots/changed" to diffy as "changed"
Example #3: Then upload folder "./reports/screenshots" to diffy as "nightly"
Example #4: Then upload folder "/tmp/webship-shots" to diffy as "webship.co-snapshot"
Example #5: Then upload folder "./out/homepage" to diffy as "homepage-release-2.0"
Example #6: Then upload folder "./diffy/before" to diffy as "before-deploy"