Update local-repository.md

Add missing sudo to command that copies eopkg to local repository

docs/packaging/advanced-config/local-repository.md

@@ -32,7 +32,7 @@ For example, building the package `libcmis` produces the packages `libcmis` and
 To copy all `.eopkg` files within a directory to the local repository, use the following command:
 
 ```bash
-cp *.eopkg /var/lib/solbuild/local
+sudo cp *.eopkg /var/lib/solbuild/local
 ```
 
 ### Using the local repository to build a package