Add Aikido Safe Chain workflow for malware protection

Co-authored-by: ryota-murakami <5501268+ryota-murakami@users.noreply.github.com>

Author: Copilot

.github/workflows/safe-chain.yml

@@ -0,0 +1,47 @@
+name: Safe Chain
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+jobs:
+  safe-chain:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+
+      - uses: pnpm/action-setup@v2
+        name: Install pnpm
+        with:
+          version: 8
+          run_install: false
+
+      - name: Get pnpm store directory
+        shell: bash
+        run: |
+          echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_ENV
+
+      - uses: actions/cache@v3
+        name: Setup pnpm cache
+        with:
+          path: ${{ env.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-store-
+
+      - name: Install Aikido Safe Chain
+        run: npm install -g @aikidosec/safe-chain
+
+      - name: Setup Aikido Safe Chain for CI
+        run: safe-chain setup-ci
+
+      - name: Install dependencies with Safe Chain protection
+        run: pnpm install