Allow manually triggered publishes #4629

Job	Run time
Check	4s
Coverage	3m 36s
Compiler (ubuntu, node current)	3m 33s
Bootstrap (debug)	8m 30s
Compiler (ubuntu, node lts/*)	2m 9s
Features	25s
Bootstrap (release)	6m 57s
Compiler (macos, node current)	2m 10s
Loader	35s
Compiler (macos, node lts/*)	1m 46s
Runtimes	34s
Compiler (windows, node current)	4m 53s
Compiler (windows, node lts/*)	4m 11s
	39m 23s

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