chore(ci): Add release-please for release-automation

.github/workflows/release-please.yml

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+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  pull-requests: write
+
+name: release-please
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@7987652d64b4581673a76e33ad5e98e3dd56832f # v4.1.3
+        with:
+          config-file: .release-please.json
+          manifest-file: .release-please-manifest.json

.release-please-manifest.json

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+{}

.release-please.json

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+{
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
+  "changelog-sections": [
+    {
+      "section": "🎉 Features",
+      "type": "feat"
+    },
+    {
+      "section": "🐛 Bug Fixes",
+      "type": "fix"
+    },
+    {
+      "section": "⚡ Performance Improvements",
+      "type": "perf"
+    },
+    {
+      "section": "🔗 Dependencies",
+      "type": "deps"
+    },
+    {
+      "section": "📝 Documentation",
+      "type": "docs"
+    },
+    {
+      "section": "🏗️ Build System",
+      "type": "build"
+    },
+    {
+      "section": "🤖 Continuous Integration",
+      "type": "ci"
+    },
+    {
+      "section": "🔧 Miscellaneous Chores",
+      "type": "chore"
+    },
+    {
+      "section": "⏪ Reverts",
+      "type": "revert"
+    },
+    {
+      "section": "✅ Tests",
+      "type": "test"
+    },
+    {
+      "section": "💄 Style",
+      "type": "style"
+    },
+    {
+      "section": "♻️ Code Refactoring",
+      "type": "refactor"
+    }
+  ],
+  "draft-pull-request": true,
+  "include-v-in-tag": true,
+  "packages": {
+    ".": {
+      "package-name": "tanka"
+    }
+  },
+  "release-type": "go"
+}