Get WASI set up enough to do a directory list #2467

Job	Run time
all-platforms (macos-11)	40m 15s
all-platforms (ubuntu-latest)	14m 43s
all-platforms (windows-latest)	20m 6s
emulator	5m 42s
jvm (8)	8m 39s
jvm (11)	7m 36s
jvm (17)	8m 49s
jvm (19)	7m 5s
loom	14m 0s
publish	0s
publish-website	0s
	2h 6m 55s

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