fix env chdir in justfile #307

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	5m 12s
build_attest_all (buildconfigs/oak_client_android_app.sh)	4m 55s
build_attest_all (buildconfigs/oak_containers_agent.sh)	5m 55s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	4m 11s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	8m 18s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	5m 33s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	7m 23s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	14m 22s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	15m 45s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	5m 9s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	4m 46s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	4m 12s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	6m 22s
build_attest_all (buildconfigs/oak_orchestrator.sh)	4m 2s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	5m 14s
build_attest_all (buildconfigs/stage0_bin.sh)	5m 15s
	1h 46m 34s

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