feat(portability): add support for FreeBSD

[bitcoin-tools]

Describe the changes and your approach

• Add support for the FreeBSD kernel and OS
  • including runtime and compile dependencies
• Add a CI job to run nodebuilder on FreeBSD
  • with console output functional testing
  • save the debug.log as an artifact

Pull Request Sign-Off

• I reviewed and approve of my changes.
• I checked of the automated test results for any irregularities.
• If appropriate, I manually tested the code changes on my local environment.
• If appropriate, I considered changes to the README or test documentation.

[bitcoin-tools]

TODO:

• finish testing on baremetal
• update the readme