feat: add release flow

Author: konojunya

.editorconfig

@@ -0,0 +1,28 @@
+# top-most EditorConfig file
+root = true
+
+# Default (fallback)
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+trim_trailing_whitespace = true
+
+# Go: use tabs (official Go style)
+[*.go]
+indent_style = tab
+indent_size = 4
+
+# YAML, JSON, Markdown, EditorConfig: 2 spaces
+[*.{yml,yaml,json,md,editorconfig}]
+indent_style = space
+indent_size = 2
+
+# GitHub Actions workflows
+[.github/workflows/*.yml]
+indent_style = space
+indent_size = 2
+
+# Makefiles must use tab
+[Makefile]
+indent_style = tab

.github/workflows/release.yaml

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+name: Release
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/create-github-app-token@v2
+        id: app-token
+        with:
+          app-id: ${{ secrets.XROSS_STARS_RELEASER_GITHUB_APP_ID }}
+          private-key: ${{ secrets.XROSS_STARS_RELEASER_GITHUB_APP_PRIVATE_KEY }}
+      - uses: googleapis/release-please-action@v4
+        with:
+          token: ${{ steps.app-token.outputs.token }}

.release-please-manifest.json

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+{
+  ".": "0.0.0"
+}

release-please-config.json

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+{
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
+  "release-type": "go",
+  "include-component-in-tag": false,
+  "packages": {
+    ".": {}
+  }
+}