Add `dist.Signer` hook which can arbitrarily sign linux/synology
artifacts. Plumb it through in `cmd/dist` and remove existing tarball
signing key. Distsign signing will happen on a remote machine, not using
a local key.
Updates #755
Updates #8760
Signed-off-by: Andrew Lytvynov <awly@tailscale.com>
This platform is technically an armv7, but has no hardware floating
point unit. armv5 is the only target Go understands to lack floating
point, so use that.
Updates #6860
Signed-off-by: David Anderson <danderson@tailscale.com>
