Add Go releaser and CI tests

.github/workflows/release.yml

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+name: Release
+on:
+  pull_request:
+  push:
+    tags:
+      - '*'
+jobs:
+  goreleaser:
+    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: 1.17.x
+
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/test.yml

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+on: [push, pull_request]
+name: Test
+jobs:
+  test:
+    strategy:
+      matrix:
+        go-version: [1.16.x, 1.17.x]
+        platform: [ubuntu-latest, windows-latest, macOS-latest]
+    name: Run ${{ matrix.go-version }} on ${{ matrix.platform }}
+    runs-on: ${{ matrix.platform }}
+    steps:
+    - name: Setup Go ${{ matrix.go-version }}
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go-version }}
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Test
+      run: go test -race -v ./...

.goreleaser.yml

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+# This is an example goreleaser.yaml file with some sane defaults.
+# Make sure to check the documentation at http://goreleaser.com
+env:
+  - GO111MODULE=on
+  - CGO_ENABLED=0
+before:
+  hooks:
+    # you may remove this if you don't use vgo
+    - go mod tidy
+builds:
+-
+  main: ./cmd/unite
+  goos:
+    - linux
+    - darwin
+    - windows
+  goarch:
+    - 386
+    - amd64
+    - arm
+    - arm64
+  ignore:
+    - goos: darwin
+      goarch: 386
+checksum:
+  name_template: '{{ .ProjectName }}_checksums.txt'
+archives:
+- name_template: '{{ .ProjectName }}_{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}'
+  replacements:
+    darwin: Darwin
+    linux: Linux
+    windows: Windows
+    386: i386
+    amd64: x86_64
+  format_overrides:
+  - goos: windows
+    format: zip
+changelog:
+  sort: asc
+  filters:
+    exclude:
+    - '^docs:'
+    - '^test:'
+    - Merge pull request
+    - Merge branch