test

Add new 'warnings' setting + enable warnings by default #372

Job	Run time
cancel-previous-runs	7s
test-both-actions-and-package (3, ubuntu-latest)	55s
test-actions (ubuntu-latest)	52s
test-both-actions-and-package (3, macOS-latest)	1m 31s
test-as-extra-package (ubuntu-latest)	52s
test-actions (macOS-latest)	1m 0s
test-package (ubuntu-latest)	53s
test-as-extra-package (windows-latest)	1m 27s
test-actions (windows-latest)	50s
test-package (macOS-latest)	59s
test-package (windows-latest)	51s
test-both-actions-and-package (3, windows-latest)	51s
test-both-actions-and-package (4, ubuntu-latest)	54s
test-both-actions-and-package (4, macOS-latest)	51s
test-both-actions-and-package (4, windows-latest)	53s
	13m 46s

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