tests

Add "@ignore" tag support #472

Job	Run time
Tests (8.1, ubuntu-latest, prefer-lowest)	18s
Tests (8.1, ubuntu-latest, prefer-stable)	14s
Tests (8.1, macos-latest, prefer-lowest)	1m 13s
Tests (8.1, macos-latest, prefer-stable)	1m 10s
Tests (8.1, windows-latest, prefer-lowest)	43s
Tests (8.1, windows-latest, prefer-stable)	39s
Tests (8.2, ubuntu-latest, prefer-lowest)	18s
Tests (8.2, ubuntu-latest, prefer-stable)	16s
Tests (8.2, macos-latest, prefer-lowest)	1m 28s
Tests (8.2, macos-latest, prefer-stable)	1m 26s
Tests (8.2, windows-latest, prefer-lowest)	51s
Tests (8.2, windows-latest, prefer-stable)	43s
Tests (8.3, ubuntu-latest, prefer-lowest)	19s
Tests (8.3, ubuntu-latest, prefer-stable)	12s
Tests (8.3, macos-latest, prefer-lowest)	2m 10s
Tests (8.3, macos-latest, prefer-stable)	1m 35s
Tests (8.3, windows-latest, prefer-lowest)	45s
Tests (8.3, windows-latest, prefer-stable)	39s
Tests (8.4, ubuntu-latest, prefer-lowest)	14s
Tests (8.4, ubuntu-latest, prefer-stable)	12s
Tests (8.4, macos-latest, prefer-lowest)	1m 56s
Tests (8.4, macos-latest, prefer-stable)	1m 15s
Tests (8.4, windows-latest, prefer-lowest)	42s
Tests (8.4, windows-latest, prefer-stable)	38s
	19m 56s

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