Build and default to heroku-24 based image #1321

Job	Run time
build.20-true	1m 48s
build.20-true	1m 48s
build.20-true	1m 48s
build.20-true	1m 48s
build.20-true	1m 48s
build.20-true	1s
build.20-true	1s
build.22-true	2m 12s
build.22-true	22m 53s
build.22-true	22m 53s
build.22-true	22m 53s
build.22-true	22m 53s
build.22-true	22m 53s
build.22-true	22m 53s
build.24-true	1m 42s
build.24-true	1m 42s
build.24-true	1m 42s
build.24-true	1m 42s
build.24-true	1m 42s
build.24-true	1m 42s
build.24-true	1m 42s
build.20-false	2m 0s
build.20-false	2m 0s
build.20-false	5m 5s
build.20-false	5m 5s
build.20-false	5m 5s
build.20-false	5m 5s
build.20-false	5m 5s
build.22-false	1m 59s
build.22-false	1m 59s
build.22-false	1m 59s
build.22-false	4m 55s
build.22-false	4m 55s
build.22-false	4m 55s
build.22-false	4m 55s
build.24-false	1m 47s
build.24-false	1m 47s
build.24-false	1m 47s
build.24-false	1m 47s
build.24-false	1m 54s
build.24-false	1m 54s
build.24-false	1m 54s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
unit.heroku-${{ matrix.heroku }}.${{ matrix.buildpack }}	0s
	3h 48m 18s

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