Set up goreleaser

.github/workflows/release.yml

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+name: release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.14
+
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          HOMEBREW_TAP_RELEASE_TOKEN: ${{ secrets.HOMEBREW_TAP_RELEASE_TOKEN }}

.goreleaser.yml

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+before:
+  hooks:
+    - go mod download
+
+builds:
+  - main: ./cmd/codeowners
+    env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - darwin
+    goarch:
+      - amd64
+
+brews:
+  - homepage: "https://github.com/hmarr/codeowners"
+    description: "Determine who owns what according CODEOWNERS files"
+
+    tap:
+      owner: hmarr
+      name: homebrew-tap
+      token: "{{ .Env.HOMEBREW_TAP_RELEASE_TOKEN }}"
+
+    commit_author:
+      name: release-bot
+      email: [email protected]
+
+    folder: Formula
+
+checksum:
+  name_template: 'checksums.txt'
+
+snapshot:
+  name_template: "{{ .Tag }}-next"
+
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^test:'