E2E test for stacked sims. #237

Job	Run time
build (linux-amd64)	1m 14s
build (linux-x86)	1m 5s
build (linux-i386)	1m 39s
build (windows-x64)	2m 16s
build (windows-x86)	2m 3s
runtimes (testscript)	1m 16s
tools	1m 42s
test_e2e	1m 2s
docker_push (simer)	29s
docker_push (testscript)	29s
publish (linux-amd64)	4s
publish (linux-x86)	11s
containers (modelc, linux-amd64)	30s
publish (linux-i386)	5s
containers (modelc-x86, linux-x86)	38s
publish (windows-x64)	4s
containers (simbus-sa, linux-amd64)	34s
publish (windows-x86)	4s
	15m 25s

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