- Use goreleaser to automate release process.
- Add new dockerfiles for fleet (with fleetctl) and fleetctl (only).
- Add GitHub Action Workflow to run goreleaser on new tag.
- Update NPM to match new archive naming.
Ubuntu 20.04 uses an older version of Node by default that does not
support the rmSync method we were using previously. This should extend
compatibility.
We found in some environments users run `sudo npm install -g fleetctl`
to install via NPM, and NPM does not execute postinstall scripts when
run as root.
This new approach should be compatible with more environments as the
download of fleetctl is done as necessary when the script is invoked.
