docker 로그인 방식 변경

.github/workflows/ci.yml

@@ -44,7 +44,7 @@ jobs:
       # Docker build
       - name: Docker build
         run: |
-          docker login -u ${{ secrets.DOCKERHUB_USERNAME }} -p ${{ secrets.DOCKERHUB_PASSWORD }}
+          echo ${{ secrets.DOCKERHUB_PASSWORD }} | docker login -u ${{ secrets.DOCKERHUB_USERNAME }} --password-stdin
           docker build -t alchive .
           docker tag alchive alchive/alchive:${GITHUB_SHA::7}
           docker push alchive/alchive:${GITHUB_SHA::7}