Add support for Homebrew

[mkuziemko]

Description

Changes proposed in this pull request:

• add generation of brew formulae for capact and populator in goreleaser

There was created a dedicated repository for Homebrew formulas.

Testing

1. clone a forked repository:

   git clone https://github.com/mkuziemko/capact/

2. replace Tap details in .goreleaser.yml file:

   tap: &homebrew-tap
   owner: mkuizemko
   name: homebrew-tap

Note: comment out a section with a docker, blobs and release as there are not needed.

3. generate a personal GitHub token
4. generate a test release:

   GITHUB_TOKEN=token goreleaser release --debug --timeout 60m

It should generate a test release in the forked repository with binaries and create a commit in the forked homebrew-tap repository.

Related issue(s)

• https://github.com/capactio/capact/issues/587