Add check-lintian run subcommand to all Debian-producing repos

[mairas]

Summary

All repositories that produce Debian packages should have a ./run check-lintian command to verify lintian compliance locally before committing.

Background

While fixing lintian CI failures in halos-mdns-publisher (#13), we went through multiple commit/push/CI cycles to fix issues. Running lintian locally before committing would have caught these issues earlier.

Repos to update

• halos-cockpit-branding
• cockpit-apt
• homarr-container-adapter
• halos-metapackages
• halos-core-containers
• halos-imported-containers
• halos-marine-containers
• halos-mdns-publisher (already done)

Implementation

Add commands like:

function build-deb {
  #@ Build Debian package for arm64
  #@ Category: Package
  echo "📦 Building Debian package..."
  .github/scripts/build-deb-package.sh
}

function check-lintian {
  #@ Run lintian on built package
  #@ Category: Package
  local deb_file
  deb_file=$(ls -t *.deb 2>/dev/null | head -1)
  if [[ -z "$deb_file" ]]; then
    echo "❌ No .deb file found. Run 'build-deb' first."
    exit 1
  fi
  echo "🔍 Running lintian on $deb_file..."
  docker run --rm -v "$(pwd):/build" -w /build rust-debtools:latest \
    lintian --info --display-info --fail-on error,warning "$deb_file"
  echo "✅ Lintian check passed"
}

The exact docker image and commands may vary per repo depending on their build tooling.