fix: github actions 오타 수정

.github/workflows/deployment.yml

@@ -48,7 +48,7 @@ jobs:
         with:
           host: ${{ secrets.EC2_HOST }} # 인스턴스 IP
           username: ${{ secrets.EC2_USER_NAME }} # 우분투 아이디
-          key: ${{ secrets.PRIVATE_KEY }} # ec2 instance pem key
+          key: ${{ secrets.EC2_PEM_KEY }} # ec2 instance pem key
           script: | # 실행할 스크립트
             docker login -u ${{secrets.DOCKER_USER}} -p ${{secrets.DOCKER_PASSWORD}}
             cd ~/thisismoney