add git fetch before exec git opera

Author: wangzhizhou

deploy

@@ -16,6 +16,7 @@ SITE_CONFIG_FILE="config.toml"
 
 echo "Deleting old publication"
 rm -rf ${SITE_PUB_DIR}
+git fetch
 git worktree prune
 rm -rf .git/worktrees/${SITE_PUB_DIR}