[add] goreleaser workflow

.github/workflows/release.yml

@@ -0,0 +1,31 @@
+name: release
+on:
+  push:
+    tags:
+    - "v[0-9]+.[0-9]+.[0-9]+"
+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: 1.15
+    - name: Cache Go modules
+      uses: actions/cache@v2
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+    - name: Run GoReleaser
+      uses: goreleaser/goreleaser-action@v2
+      with:
+        version: latest
+        args: release --rm-dist
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -24,3 +24,4 @@
 /Godeps/
 
 # End of https://www.toptal.com/developers/gitignore/api/go
+dist/

.goreleaser.yml

@@ -0,0 +1,36 @@
+project_name: dockerhub_ratelimit_exporter
+env:
+- GO111MODULE=on
+before:
+  hooks:
+  - go mod tidy
+builds:
+- main: .
+  binary: dockerhub_ratelimit_exporter
+  ldflags:
+  - -s -w
+  - -X main.Version={{.Version}}
+  - -X main.Revision={{.ShortCommit}}
+  env:
+  - CGO_ENABLED=0
+  goos:
+  - linux
+  - windows
+  - darwin
+  goarch:
+  - amd64
+  - arm
+  - arm64
+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
+release:
+  prerelease: auto