fix: update SSH configuration in backend deployment workflow to use standardized secret names for improved clarity and consistency

Author: nimit9

.github/workflows/backend-deploy.yml

@@ -43,9 +43,9 @@ jobs:
       - name: Deploy to EC2
         uses: appleboy/ssh-action@master
         with:
-          host: ${{ secrets.EC2_HOST }}
-          username: ${{ secrets.EC2_USERNAME }}
-          key: ${{ secrets.EC2_SSH_KEY }}
+          host: ${{ secrets.SSH_HOST }}
+          username: ${{ secrets.SSH_USERNAME }}
+          key: ${{ secrets.SSH_KEY }}
           script: |
             # Pull the latest image
             docker pull ${{ secrets.DOCKER_USERNAME }}/simcasino-api:latest