Run Go tests in Windows, Mac, Linux. Go version 1.12/1.13 both with Modules and GOPATH.

github-workflows-goreleaser.yml

name: Release
on:
  release:
    types:
      - published

jobs:
  release:
    name: Release
    runs-on: ubuntu-latest
    steps:
      -
        name: Set up Go 1.13
        uses: actions/setup-go@v1
        with:
          go-version: 1.13
        id: go
      -
        name: Checkout
        uses: actions/checkout@master
      -
        name: Run GoReleaser
        env:
          GITHUB_TOKEN: ${{ secrets.GORELEASER_GITHUB_TOKEN }}
        uses: goreleaser/goreleaser-action@v1
        with:
          version: latest
          args: release --rm-dist

github-workflows-tests.yml

name: Tests
on: [push]
jobs:

  tests-on:
    name: ${{matrix.go-version}} ${{matrix.os}}
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        go-version: [1.12.x, 1.13.x]
        os: [macos-latest, windows-latest, ubuntu-latest]
    steps:
    - name: Check out code into the Go module directory
      uses: actions/checkout@v1
      with:
        fetch-depth: 1
    - name: Test
      run: |
        go mod tidy -v
        go test -race ./...

  tests-off:
    name: (GOPATH) ${{matrix.go-version}} ${{matrix.os}}
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        go-version: [1.12.x, 1.13.x]
        os: [macos-latest, windows-latest, ubuntu-latest]
    env:
      GO111MODULE: off
    steps:
    - name: Checkout code
      uses: actions/checkout@v1
      with:
        fetch-depth: 1
        path: src/github.com/${{ github.repository }}
    - name: Test
      env:
        GOPATH: ${{runner.workspace}}
      run: |
        go get -t -v ./...
        go test -race ./...

goreleaser.yml

builds:
  -
    main: ./cmd/widget/main.go
    env:
      - CGO_ENABLED=0
    ldflags:
      - -s -w -X "github.com/markbates/widget.Version={{.Tag}}"
    goos:
      - darwin
      - linux
      - windows
    goarch:
      - amd64
      - 386
      - arm
      - arm64
    goarm:
      - 6
      - 7
archives:
  -
    replacements:
      '386': i386
      darwin: Darwin
      linux: Linux
      windows: Windows
      amd64: x86_64
checksum:
  name_template: checksums.txt
snapshot:
  name_template: '{{ .Tag }}-next'
changelog:
  sort: asc
  filters:
    exclude:
      - '^docs:'
      - '^test:'
brews:
  -
    name: 'widget'
    github:
      owner: 'markbates'
      name: 'homebrew-tap'
    install: |
      bin.install "widget"

Just what I was looking for. Thanks.