Using the generic script will allow us to put more generic stuff in there without code repetition, e.g. the checks for the custom tags and skipping the builds early.
Coverage remained the same at 100.0% when pulling 21c7872cc9a50d5144d756739f8deb59854f4110 on bsipocz:ci-helpers_use_generic_script into acaa02eb6b55a2488d929ced2c5d839f78db56f5 on astropy:master.
Using the generic script will allow us to put more generic stuff in there without code repetition, e.g. the checks for the custom tags and skipping the builds early.