feat: bash 쉘 추가

.github/workflows/backend-prod-cd.yml

@@ -40,7 +40,6 @@ jobs:
     needs: [ backend-docker-build-and-push ]
     if: ${{ needs.backend-docker-build-and-push.result == 'success' }}
     runs-on: [ self-hosted, enble-runner ]
-    timeout-minutes: 2 # 이 작업은 2분 후에 타임아웃됩니다.
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
@@ -49,6 +48,7 @@ jobs:
         run: |
           echo "${{ secrets.PEM_KEY }}" > pem_key
           chmod 600 pem_key
+        shell: bash
 
       - name: WAS 인스턴스 접속 및 애플리케이션 실행 (첫 번째 시도)
         run: |
@@ -57,6 +57,7 @@ jobs:
           docker pull ${{ env.DOCKER_HUB_REPOSITORY }}:${{ github.sha }}
           docker run -d -p 8080:8080 --name agilehub-backend ${{ env.DOCKER_HUB_REPOSITORY }}:${{ github.sha }}
           EOF
+        shell: bash
 
   attempt-with-second-runner:
     needs: [ attempt-with-first-runner ]