feat: PR作成時にプレビュー環境用データベースを自動作成するworkflowを追加

- preview-db-create.ymlを追加
- PR作成時にTurso Platform APIを使用してpreview-pr{number}-authデータベースを作成
- 作成したデータベースのURLとトークンをVercelのプレビュー環境変数として設定
- PRにデータベース作成完了のコメントを投稿

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: gn-t-k

.github/workflows/preview-db-create.yml

@@ -0,0 +1,91 @@
+name: Preview Database Create
+
+on:
+  pull_request:
+    types: [opened, reopened]
+
+jobs:
+  create-preview-db:
+    name: Create Preview Database
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: Checkout
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+
+      - name: Create Preview Database
+        env:
+          TURSO_API_TOKEN: ${{ secrets.TURSO_PLATFORM_API_TOKEN }}
+          TURSO_ORG_SLUG: ${{ secrets.TURSO_ORG_SLUG }}
+          TURSO_GROUP: ${{ secrets.TURSO_GROUP }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+        run: |
+          DB_NAME="preview-pr${PR_NUMBER}-auth"
+
+          # データベースを作成
+          RESPONSE=$(curl -X POST \
+            -H "Authorization: Bearer ${TURSO_API_TOKEN}" \
+            -H "Content-Type: application/json" \
+            -d "{\"name\":\"${DB_NAME}\",\"group\":\"${TURSO_GROUP}\"}" \
+            "https://api.turso.tech/v1/organizations/${TURSO_ORG_SLUG}/databases")
+
+          echo "Database creation response: ${RESPONSE}"
+
+          # データベースのURLを取得
+          DB_HOSTNAME=$(echo "${RESPONSE}" | jq -r '.database.Hostname')
+          DB_URL="libsql://${DB_HOSTNAME}"
+
+          echo "DB_URL=${DB_URL}" >> $GITHUB_ENV
+          echo "DB_NAME=${DB_NAME}" >> $GITHUB_ENV
+
+      - name: Create Database Token
+        env:
+          TURSO_API_TOKEN: ${{ secrets.TURSO_PLATFORM_API_TOKEN }}
+          TURSO_ORG_SLUG: ${{ secrets.TURSO_ORG_SLUG }}
+        run: |
+          # データベースアクセス用のトークンを作成
+          TOKEN_RESPONSE=$(curl -X POST \
+            -H "Authorization: Bearer ${TURSO_API_TOKEN}" \
+            "https://api.turso.tech/v1/organizations/${TURSO_ORG_SLUG}/databases/${DB_NAME}/auth/tokens?expiration=never")
+
+          echo "Token creation response (hidden for security)"
+
+          # トークンを取得
+          DB_AUTH_TOKEN=$(echo "${TOKEN_RESPONSE}" | jq -r '.jwt')
+
+          echo "DB_AUTH_TOKEN=${DB_AUTH_TOKEN}" >> $GITHUB_ENV
+
+      - name: Set Vercel Environment Variables
+        env:
+          VERCEL_TOKEN: ${{ secrets.VERCEL_TOKEN }}
+          VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+        run: |
+          # Vercelのプレビュー環境に環境変数を設定
+          # TURSO_AUTH_DATABASE_URL
+          curl -X POST \
+            -H "Authorization: Bearer ${VERCEL_TOKEN}" \
+            -H "Content-Type: application/json" \
+            -d "{\"key\":\"TURSO_AUTH_DATABASE_URL\",\"value\":\"${DB_URL}\",\"type\":\"encrypted\",\"target\":[\"preview\"],\"gitBranch\":\"${{ github.head_ref }}\"}" \
+            "https://api.vercel.com/v10/projects/${VERCEL_PROJECT_ID}/env"
+
+          # TURSO_AUTH_DATABASE_AUTH_TOKEN
+          curl -X POST \
+            -H "Authorization: Bearer ${VERCEL_TOKEN}" \
+            -H "Content-Type: application/json" \
+            -d "{\"key\":\"TURSO_AUTH_DATABASE_AUTH_TOKEN\",\"value\":\"${DB_AUTH_TOKEN}\",\"type\":\"encrypted\",\"target\":[\"preview\"],\"gitBranch\":\"${{ github.head_ref }}\"}" \
+            "https://api.vercel.com/v10/projects/${VERCEL_PROJECT_ID}/env"
+
+      - name: Comment PR with Database Info
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        env:
+          DB_NAME: ${{ env.DB_NAME }}
+          DB_URL: ${{ env.DB_URL }}
+        with:
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: `## 🗄️ Preview Database Created\n\n✅ プレビュー環境用のデータベースを作成しました！\n\n**Database Name**: ${process.env.DB_NAME}\n**Database URL**: ${process.env.DB_URL}\n\n> ⚠️ このデータベースはPRがクローズされると自動的に削除されます。`
+            })