ci: fix ansible and playbook for it

.gitea/workflows/demo.yaml

@@ -70,7 +70,7 @@ jobs:
           SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
         run: |
           mkdir -p ~/.ssh
-          printf '%s\n' "$SSH_PRIVATE_KEY" > ~/.ssh/deploy_key
+          printf '%s' "$SSH_PRIVATE_KEY" | tr -d '\r' > ~/.ssh/deploy_key
           chmod 600 ~/.ssh/deploy_key
           ssh-keygen -y -f ~/.ssh/deploy_key >/dev/null