fix(cd): correct ssh key handling in deploy pipeline

Author: renancvitor

.github/workflows/cd.yml

@@ -44,9 +44,7 @@ jobs:
       - name: Setup SSH
         run: |
           mkdir -p ~/.ssh
-          cat << 'EOF' > ~/.ssh/ec2.pem
-          ${{ secrets.EC2_SSH_KEY }}
-          EOF
+          printf "%s\n" "${{ secrets.EC2_SSH_KEY }}" > ~/.ssh/ec2.pem
           chmod 600 ~/.ssh/ec2.pem
           ssh-keyscan -H ${{ secrets.EC2_HOST }} >> ~/.ssh/known_hosts