buildx: test install #645

Job	Run time
prepare-itg	19s
test	1m 36s
test-itg (docker/install.test.itg.ts, ubuntu-latest)	41s
test-itg (docker/install.test.itg.ts, macos-13)	7m 1s
test-itg (docker/install.test.itg.ts, macos-latest)	9m 40s
test-itg (docker/install.test.itg.ts, windows-latest)	1m 10s
test-itg (buildx/bake.test.itg.ts, ubuntu-latest)	31s
test-itg (buildx/bake.test.itg.ts, macos-13)	50s
test-itg (buildx/bake.test.itg.ts, macos-latest)	1m 39s
test-itg (buildx/bake.test.itg.ts, windows-latest)	1m 3s
test-itg (buildx/install.test.itg.ts, ubuntu-latest)	30s
test-itg (buildx/install.test.itg.ts, macos-13)	1m 6s
test-itg (buildx/install.test.itg.ts, macos-latest)	52s
test-itg (buildx/install.test.itg.ts, windows-latest)	1m 10s
	28m 8s

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