Merge pull request #1290 from gliderlabs/drop-arm #1337

Job	Run time
build.20-true	15m 46s
build.22-true	14m 38s
build.20-false	5m 12s
build.22-false	3m 42s
unit.heroku-20.buildpack-clojure	4m 6s
unit.heroku-22.buildpack-clojure	3m 38s
unit.heroku-20.buildpack-go	3m 20s
unit.heroku-22.buildpack-go	3m 13s
unit.heroku-20.buildpack-gradle	4m 4s
unit.heroku-22.buildpack-gradle	3m 45s
unit.heroku-20.buildpack-java	4m 18s
unit.heroku-22.buildpack-java	3m 10s
unit.heroku-20.buildpack-multi	3m 43s
unit.heroku-22.buildpack-multi	4m 5s
unit.heroku-20.buildpack-nodejs	3m 58s
unit.heroku-22.buildpack-nodejs	2m 55s
unit.heroku-20.buildpack-null	3m 15s
unit.heroku-22.buildpack-null	3m 17s
unit.heroku-20.buildpack-php	3m 20s
unit.heroku-22.buildpack-php	3m 33s
unit.heroku-20.buildpack-play	4m 45s
unit.heroku-22.buildpack-play	3m 59s
unit.heroku-20.buildpack-python	3m 40s
unit.heroku-22.buildpack-python	3m 44s
unit.heroku-20.buildpack-ruby	3m 52s
unit.heroku-22.buildpack-ruby	3m 13s
unit.heroku-20.buildpack-scala	4m 25s
unit.heroku-22.buildpack-scala	3m 50s
unit.heroku-20.buildpack-static	4m 19s
unit.heroku-22.buildpack-static	3m 42s
	2h 16m 27s

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