ci: add GitHub Actions auto deploy workflow

Author: kjhh2605

.github/workflows/deploy.yml

@@ -0,0 +1,23 @@
+name: Deploy to EC2
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Deploy via SSH
+        uses: appleboy/ssh-action@v1.0.3
+        with:
+          host: ${{ secrets.EC2_HOST }}
+          username: ${{ secrets.EC2_USER }}
+          key: ${{ secrets.EC2_KEY }}
+          script: |
+            cd ~/Spring
+            git pull origin master
+            docker-compose up --build -d
+            docker-compose ps