remove unnecessary -i flag

.github/workflows/ghaymah.yml

@@ -24,7 +24,7 @@ jobs:
         env:
           SQL_CONN: ${{ secrets.SQL_CONN }}
         run: |
-          sed -i "s|^db-uri: .*|db-uri: ${SQL_CONN}|" config.yml.example > /tmp/config.yml.example && mv /tmp/config.yml.example config.yml.example
+          sed "s|^db-uri: .*|db-uri: ${SQL_CONN}|" config.yml.example > /tmp/config.yml.example && mv /tmp/config.yml.example config.yml.example
 
       - name: deploy
         run: $HOME/ghaymah/bin/gy resource app launch