feat: enable custom file/directory builders (#413) #386

Job	Run time
js-test-and-release / build	1m 4s
js-test-and-release / check	1m 45s
js-test-and-release / test-node (ubuntu-latest, lts/*)	1m 40s
js-test-and-release / test-chrome	1m 48s
js-test-and-release / test-node (windows-latest, lts/*)	3m 45s
js-test-and-release / test-node (macos-latest, lts/*)	2m 15s
js-test-and-release / test-chrome-webworker	16s
js-test-and-release / test-firefox	1m 16s
js-test-and-release / test-firefox-webworker	1m 0s
js-test-and-release / test-webkit (macos-latest, lts/*)	1m 33s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	1m 31s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	1m 40s
js-test-and-release / test-electron-renderer	1m 23s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	1m 29s
js-test-and-release / test-electron-main	24s
js-test-and-release / release-check	4s
js-test-and-release / release	1m 4s
	23m 57s

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