Pull in the sysroot archive as a Bazel dependency #498

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	4m 56s
build_attest_all (buildconfigs/oak_client_android_app.sh)	50m 56s
build_attest_all (buildconfigs/oak_containers_agent.sh)	5m 42s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	28m 39s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	11m 1s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	6m 40s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	8m 37s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	16m 15s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	19m 0s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	5m 4s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	4m 34s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	4m 53s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	4m 55s
build_attest_all (buildconfigs/oak_orchestrator.sh)	4m 37s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	18m 3s
build_attest_all (buildconfigs/stage0_bin.sh)	41m 29s
	3h 55m 21s

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