Run goreleaser on GitHub Actions

.github/workflows/release.yml

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+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: 1
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.goreleaser.yml

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+project_name: goptuna
+env:
+  - GO111MODULE=on
+before:
+  hooks:
+    - go mod tidy
+builds:
+  - main: ./cmd/main.go
+    binary: goptuna
+    ldflags:
+      - -s -w
+      - -X main.version={{.Version}}
+      - -X main.revision={{.ShortCommit}}
+archives:
+  - name_template: '{{ .ProjectName }}_{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}'
+    replacements:
+      darwin: darwin
+      linux: linux
+      386: i386
+      amd64: x86_64
+    format: zip
+release:
+  prerelease: auto