Then compare diffy "ENV1" with "ENV2"

Kick off a Diffy comparison between two project environments.
Uses DIFFY_ENV1_URL / DIFFY_ENV2_URL when either side is "custom".

Then (I |we )*compare diffy "([^"]*)" with "([^"]*)"

Example #1: Then compare diffy "prod" with "stage"
Example #2: Then compare diffy "production" with "staging"
Example #3: Then compare diffy "prod" with "dev"
Example #4: Then compare diffy "stage" with "dev"
Example #5: Then compare diffy "prod" with "baseline"
Example #6: Then compare diffy "baseline" with "custom"
Example #7: Then compare diffy "custom" with "custom"
Example #8: Then compare diffy "production" with "development"