only use local sandbox if same origin #491

Job	Run time
vars	1s
sites / Deploy sites	7m 16s
tests / test (macos-latest)	12m 31s
tests / test (ubuntu-latest)	13m 18s
tests / api-e2e-test	13m 36s
tests / e2e-test (macos-latest)	16m 7s
tests / e2e-test (ubuntu-latest)	8m 0s
docker / docker	4m 28s
electron / electron (macos-latest)	7m 35s
electron / electron (ubuntu-latest)	9m 17s
electron / electron (windows-latest)	14m 55s
	1h 47m 4s

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