Replace gox and ghr with goreleaser

[kishaningithub]

Go Releaser lets you do release management (generation of binaries, rpms, debs, brew taps, change logs etc) with a single yaml file.
You can also put in godownloader to generate an install script that can be used for downloading release binaries from github releases. It is made by the same goreleaser team

For inspiration you can take a look at the awesome golangci-lint project

If you are fine with this change i can put in a PR

Bottom line: Installation and release management becomes way cooler 😎

[aeneasr]

Sounds good, I'll probably do that myself because the build pipeline is a bit tricky to test.