workflows: Add sudo for ensuring cleanup

Signed-off-by: Hiroshi Hatake <[email protected]>

Author: cosmo0920

.github/workflows/staging-build.yaml

@@ -42,9 +42,9 @@ jobs:
           echo "Before cleanup:"
           df -h
           docker system prune -af
-          rm -rf /usr/share/dotnet
-          rm -rf /usr/local/lib/android
-          rm -rf /opt/ghc
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /usr/local/lib/android
+          sudo rm -rf /opt/ghc
           echo "After cleanup:"
           df -h
         shell: bash