chore(cd): fix ssh key handling for EC2 deploy

Author: renancvitor

.github/workflows/cd.yml

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