CI: Configure automatic releases using goreleaser

This will automatically build and package the CLI every time a
v<something> tag is pushed.

.github/workflows/release.yaml

@@ -0,0 +1,28 @@
+name: release
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  test:
+    name: Build and package
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+    - name: Setup Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: '1.15.6'
+    - name: Check formatting
+      run: test -z $(gofmt -l **.go)
+    - name: Run GoReleaser
+      uses: goreleaser/goreleaser-action@v2
+      with:
+        version: latest
+        args: release --rm-dist
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.goreleaser.yml

@@ -0,0 +1,31 @@
+builds:
+  - id: cli
+    binary: gdqcli
+    main: ./cmd/gdqcli
+    mod_timestamp: '{{ .CommitTimestamp }}'
+    gcflags:
+      - all=-trimpath={{.Env.GOPATH}}
+    env:
+      - CGO_ENABLED=0
+    goos:
+      - windows
+      - darwin
+      - linux
+    goarch:
+      - amd64
+      - arm64
+      - arm
+    goarm:
+      - 6
+      - 7
+archives:
+  - id: cli
+    builds:
+      - cli
+    wrap_in_directory: true
+    files:
+      - LICENSE
+      - README.md
+    format_overrides:
+      - goos: windows
+        format: zip