Add GoReleaser

[harnyk]

Problem

Currently, we have to manually build and upload the binaries for each release.

Solution

Use GoReleaser to automate the release process.

Notes

• https://goreleaser.com/

Release workflow after this PR

• Create a new tag
• Push the tag
• GoReleaser will build and upload the binaries to GitHub

Notes:

• The tag must be in the format vX.Y.Z (e.g. v1.2.3)
• The binaries will be uploaded to GitHub under the release with the same name as the tag
• Release notes will be generated from the PRs merged since the last release, so take care to write good PR titles and descriptions