Add release automation and CI/CD setup

Configure GitHub Actions and GoReleaser for automated
cross-platform binary releases.

Author: hkobayash

.github/workflows/release.yml

@@ -0,0 +1,28 @@
+name: release
+
+on:
+  push:
+    tags:
+      - v*
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: ./go.mod
+
+      - uses: goreleaser/goreleaser-action@v6
+        with:
+          version: latest
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -25,8 +25,13 @@ go.work
 go.work.sum
 
 # env file
+.envrc
 .env
 
 # Editor/IDE
 # .idea/
 # .vscode/
+
+.claude/
+elasticache-token
+dist

.goreleaser.yml

@@ -0,0 +1,31 @@
+# This is an example goreleaser.yaml file with some sane defaults.
+# Make sure to check the documentation at http://goreleaser.com
+version: 2
+before:
+  hooks:
+    - go mod download
+builds:
+  -
+    env:
+      - CGO_ENABLED=0
+    main: ./cmd/elasticache-token/main.go
+    flags:
+      - -trimpath
+    goarch:
+      - amd64
+      - arm64
+    goos:
+      - darwin
+      - linux
+checksum:
+  name_template: 'checksums.txt'
+snapshot:
+  name_template: "{{ .Tag }}-next"
+changelog:
+  sort: asc
+  filters:
+    exclude:
+    - '^docs:'
+    - '^test:'
+release:
+  prerelease: auto