Add a minimal starter template for writing enclave apps. #738

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	18m 42s
build_attest_all (buildconfigs/oak_client_android_app.sh)	50m 13s
build_attest_all (buildconfigs/oak_containers_agent.sh)	12m 53s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	35m 15s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	26m 15s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	23m 16s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	23m 6s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	26m 23s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	27m 9s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	18m 35s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	18m 15s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	17m 49s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	18m 53s
build_attest_all (buildconfigs/oak_orchestrator.sh)	17m 47s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	44m 36s
build_attest_all (buildconfigs/stage0_bin.sh)	43m 14s
build_attest_all (buildconfigs/stage0_bin_tdx.sh)	41m 58s
	7h 44m 19s

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