feat: add opt-in Bun runtime detection #4

Job	Run time
orchestrate	0s
run_tests_linux	0s
doctests	0s
check_workspace_binaries	0s
check_dependencies	0s
run_tests_windows	0s
check_scripts	0s
run_tests_mac	0s
build_nix_linux_x86_64	0s
check_postgres_and_protobuf_migrations	0s
check_licenses	0s
build_nix_mac_aarch64	0s
check_docs	0s
tests_pass	-1s
check_style	-7s
	-8s

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