Fix CI to NOT run publish on every pull request #2735

Job	Run time
minimal	25s
rustfmt-clippy	28s
msrv	54s
docs	18s
quickchecking	14s
check-cfg	22s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 40s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 44s
test-book	8s
test-expectations (ubuntu-latest)	45s
test-no-headers	24s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 35s
test-expectations (macos-latest)	39s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 33s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	2m 45s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	2m 8s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	2m 46s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	2m 4s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	3m 56s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	3m 58s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	4m 23s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	4m 8s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	4m 52s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	4m 49s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	4m 47s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	4m 58s
test (ubuntu-latest, 16.0, 0, 0, 1)	2m 24s
test (macos-latest, 16.0, 0, 0, 0)	1m 52s
success	1s
	1h 1m 0s

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