chore: don't cancel concurrent main builds (#151) #488

Job	Run time
matrix-prep-bazelversion	4s
matrix-prep-os	4s
test (ubuntu-latest, true, 7.1.1, .)	3m 25s
test (ubuntu-latest, true, 7.1.1, e2e/smoke)	50s
test (ubuntu-latest, false, 7.1.1, .)	3m 22s
test (ubuntu-latest, false, 7.1.1, e2e/loaders)	43s
test (ubuntu-latest, false, 7.1.1, e2e/smoke)	53s
test (ubuntu-latest, false, 7.1.1, e2e/worker)	38s
test (macos-latest, true, 7.1.1, .)	3m 16s
test (macos-latest, true, 7.1.1, e2e/smoke)	55s
test (macos-latest, false, 7.1.1, .)	2m 43s
test (macos-latest, false, 7.1.1, e2e/loaders)	49s
test (macos-latest, false, 7.1.1, e2e/smoke)	1m 22s
test (macos-latest, false, 7.1.1, e2e/worker)	48s
test (windows-latest, true, 7.1.1, .)	28s
test (windows-latest, true, 7.1.1, e2e/smoke)	5m 3s
test (windows-latest, false, 7.1.1, .)	21s
test (windows-latest, false, 7.1.1, e2e/loaders)	3m 17s
test (windows-latest, false, 7.1.1, e2e/smoke)	1m 35s
test (windows-latest, false, 7.1.1, e2e/worker)	2m 34s
	33m 10s

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