v0.7.0

This is a major Erlang and Buildroot update. This updates from Erlang/OTP 27 to
Erlang/OTP 28.

• Changes

  • Fix rpicam-vid by adding the ffmpeg package so that it's possible to encode H.264 videos. It's in
    software, though.

• Package updates

  • nerves_system_br v1.32.3 release notes

• Updated dependencies

  • Erlang/OTP 28.1.1
  • Buildroot 2025.05.2