Simplify SSH command quoting in rsync

.gitea/workflows/deploy.yml

@@ -28,7 +28,7 @@ jobs:
             --exclude=".gitea/" \
             --exclude=".gitignore" \
             --exclude="designs/" \
-            -e 'ssh -p '"$SSH_PORT"' -i ~/.ssh/id_rsa -o StrictHostKeyChecking=no' \
+            -e "ssh -p ${SSH_PORT} -i ~/.ssh/id_rsa -o StrictHostKeyChecking=no" \
             ./ \
             ${SSH_USER}@${SSH_HOST}:${TARGET_DIR}
         env: