feat: support setting up existing container as devcontainer #850

Job	Run time
test-e2e-windows (build)	1m 23s
test-e2e (build)	3m 43s
test-e2e-windows (ide)	4m 44s
test-e2e (ide)	4m 32s
test-e2e-windows (ssh)	1m 28s
test-e2e-windows (up-docker)	6m 0s
test-e2e (integration)	3m 59s
test-e2e-windows (up-docker-build)	5m 42s
test-e2e (machine)	3m 31s
test-e2e-windows (up-docker-compose)	10m 58s
test-e2e (machineprovider)	4m 15s
test-e2e (provider)	3m 15s
test-e2e (proxyprovider)	4m 2s
test-e2e (ssh)	3m 41s
test-e2e (up)	5m 18s
test-e2e (up-docker)	4m 57s
test-e2e (up-podman)	3m 57s
test-e2e (up-docker-compose)	5m 58s
test-e2e (up-docker-build)	4m 0s
test-e2e (up-docker-compose-build)	4m 37s
	1h 30m 0s

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