Create a `oak_containers_nvidia_system_image` rule in justfile #67

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	2m 11s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	13m 33s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	6m 50s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	3m 55s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	5m 54s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	11m 59s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	2m 15s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	2m 12s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	2m 37s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	2m 39s
build_attest_all (buildconfigs/oak_orchestrator.sh)	2m 24s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	2m 57s
build_attest_all (buildconfigs/stage0_bin.sh)	2m 36s
	1h 2m 2s

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