The tap moved to git.trivk.dev. Gitea Runner has no parallel steps, so
the two bumps run one after the other. The scripts ask api.github.com
with curl instead of gh, which needs a GitHub token the Gitea job does
not have; two unauthenticated requests per run stay far under the limit.
The README now taps with the git.trivk.dev URL.
Upstream installer.sh always runs `netbird service stop` and
`netbird service uninstall` with stderr shown. uninstall_preflight_steps
has already removed the service by then, so every upgrade printed two
launchctl errors even though nothing failed.
Run the same steps from postflight_steps instead and silence only the
stop and uninstall calls. A failed service install or start now fails
the cask instead of being swallowed by `|| true`.