Add omni-infra-provider-bare-metal community app

[Cliftonz]

App Addition Proposal

I'd like to add omni-infra-provider-bare-metal (v0.9.0) to the community train.

What it does

Sidero Omni infrastructure provider that PXE-boots and manages bare-metal machines as Talos Linux nodes. Companion to the omni-infra-provider-truenas app (PR #4859) — that one provisions VMs, this one provisions physical hardware.

Details

• Upstream: https://github.com/siderolabs/omni-infra-provider-bare-metal
• License: MPL-2.0
• Image: ghcr.io/siderolabs/omni-infra-provider-bare-metal:v0.9.0
• Categories: management
• min_scale_version: 25.10.0

Networking

The provider runs a DHCP proxy for iPXE boot, which fundamentally needs L2 broadcast access. The catalog app exposes a gated host_network toggle (default off) plus the standard networks list so users can attach to a docker macvlan/ipvlan instead. The DHCP proxy can also be disabled entirely or run in port-4011-only mode for users who chain it behind their existing DHCP server.

Configuration

Upstream supports OMNI_ENDPOINT and OMNI_SERVICE_ACCOUNT_KEY as env vars; everything else is CLI flags. Catalog template uses set_command() to build the flag list from questions.yaml values (same pattern as bitcoind, adguard-home, arti).

Happy to draft a PR if this is wanted.