doc: update README (#2323)

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

README.md

@@ -120,6 +120,7 @@ For **Linux** users:
 
   `deb` how to:
   ```shell
+  sudo mkdir -p /etc/apt/keyrings
   curl https://codeberg.org/api/packages/yataro/debian/repository.key | sudo tee /etc/apt/keyrings/sourcegit.asc
   echo "deb [signed-by=/etc/apt/keyrings/sourcegit.asc, arch=amd64,arm64] https://codeberg.org/api/packages/yataro/debian generic main" | sudo tee /etc/apt/sources.list.d/sourcegit.list
   sudo apt update