Change releases to tar.gz instead of zip

[haxorof]

In for example several very simple Linux installation unzip is not provided out-of-the-box which will required additional steps to install unzip. Also handling zip in combination with curl is not possible either. Delivering tar.gz would allow users which cannot use the Docker version of prometheus-sql to just do this:

curl -SL https://github.com/chop-dbhi/prometheus-sql/releases/download/1.1.0/prometheus-sql-linux-amd64.tar.gz | tar -xzvC /opt/prometheus-sql

Either change all releases to tar.gz or just leave Windows release as zip because it does not have native support for tar.gz.

@bruth: Does this change cause problems in the way you use prometheus-sql today? any thoughts on this?

[bruth]

I agree keeping .zip for the Windows build and changing the others.