add github workflow

.github/workflows/deploy.yml

@@ -0,0 +1,30 @@
+name: Deploy to VPS
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up SSH
+        uses: webfactory/ssh-agent@v0.8.1
+        with:
+          ssh-private-key: ${{ secrets.VPS_SSH_KEY }}
+
+      - name: Deploy via SSH
+        env:
+          USER: ${{ secrets.VPS_USER }}
+          HOST: ${{ secrets.VPS_HOST }}
+        run: |
+          ssh -o StrictHostKeyChecking=no $USER@$HOST << 'EOF'
+          cd ~/portfolio/
+          git pull origin main
+          docker compose up --build -d
+          EOF