ci: use ~/.ssh/config for SFTP auth options instead of CLI flags

Passing -o flags directly on the sftp -b - command line doesn't work:
sftp batch mode reads commands from stdin, conflicting with how sshpass
intercepts the password prompt when inline options are present.

Write a ~/.ssh/config stanza for ${SFTP_SERVER} containing:
  PubkeyAuthentication no
  PreferredAuthentications password

Using grouped echo commands (avoids heredoc/YAML indentation issues).
Also add chmod 600 on the config file as required by SSH.

Co-authored-by: igaw <[email protected]>

Author: Copilot

.github/workflows/upload.yml

@@ -76,16 +76,19 @@ jobs:
           sudo apt-get install -y sshpass
           mkdir -p ~/.ssh
           echo "${SFTP_HOST_KEY}" > ~/.ssh/known_hosts
+          {
+            echo "Host ${SFTP_SERVER}"
+            echo "    PubkeyAuthentication no"
+            echo "    PreferredAuthentications password"
+          } > ~/.ssh/config
+          chmod 600 ~/.ssh/config
           (
             echo "cd /upload"
             for f in upload/nvme-cli-*; do
               [ -f "$f" ] || continue
               echo "put $f $(basename "$f")"
             done
-          ) | sshpass -e sftp -b - \
-                -o PubkeyAuthentication=no \
-                -o PreferredAuthentications=password \
-                "${SFTP_USERNAME}@${SFTP_SERVER}"
+          ) | sshpass -e sftp -b - "${SFTP_USERNAME}@${SFTP_SERVER}"
 
   upload-release-assets:
     name: upload GitHub release assets