BeagleBoard: use templating, add repositories and GPG key

Prashanth Krequested to merge
krvprashanth/extrepo-data:beagleboard into master

Use common template for repositories that differ only slightly to reduce duplication.

  • Add beagleboard-amd64 repository
  • Add trixie repositories:
    • debian-trixie-armhf
    • debian-trixie-arm64
    • debian-trixie-riscv64
  • Add GPG key for trixie repositories

Refactor to match the repositories structure on debian.beagleboard.org

Signed-off-by: Kurva Prashanth krvprashanth@riseup.net

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