feat(on-hots-cli): support empty proxy on config generation #1249

Job	Run time
codespell	13s
cargo fmt	16s
cargo doc	1m 42s
cargo clippy	2m 14s
⚖️ Check third party licenses	4m 45s
cargo shear (unused dependencies)	12s
ubuntu / stable / coverage	4m 7s
Unit, docs and onhost integration tests	6m 51s
Build release binaries	2m 20s
tests as root	4m 5s
Unit test for embedded downloader	37s
K8s integration tests (part1)	8m 37s
K8s integration tests (part2)	6m 6s
build-windows-binary	3m 40s
K8s integration tests (flux-self-update)	7m 5s
k8s-e2e-tests / K8s e2e tests infra	9m 47s
security / Rust audit scanner	2m 45s
k8s-e2e-tests / K8s e2e tests	3s
🟢 All required checks and tests pass	3s
	1h 5m 28s

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