Airvolute cockpit deployment

[Niki-dev12]

Summary

Adds an Airvolute Cockpit deployment overlay to dcs-deploy.

The overlay keeps dcs-deploy limited to deployment/setup logic and consumes Cockpit package bundles from the airvolute-cockpit-packages repository as a versioned artifact.

What Changed

• Added airvolute_cockpit local overlay.
• Added support for --cockpit-packages / --cockpit_packages.
• Allows Cockpit packages archive to be provided as either:
  • local file path
  • URL via local/config_db.json
• Installs Airvolute Cockpit packages into /usr/local/share/cockpit.
• Adds a first-boot service that installs official Ubuntu Cockpit packages with apt.
• Applies Airvolute branding and password-policy customization on first boot.
• Ignores copied/generated Cockpit package payloads so they are not committed to dcs-deploy.

Usage Example

python3 dcs_deploy.py flash orin_nx 62 2.0 default nvme full \
  --rootfs=/path/rootfs_merged.tar.bz2 \
  --cockpit-packages=/path/airvolute-cockpit-packages/build/airvolute-cockpit-packages-21870ec-dirty.tar.gz \
  --regen