Add comparions before/after diskspace cleanup

Author: tuhaihe

.github/workflows/build-cloudberry.yml

@@ -1253,6 +1253,8 @@ jobs:
             rpm -qi apache-cloudberry-db-incubating
 
             # Clean up downloaded RPM artifacts to free disk space
+            echo "Disk space before RPM cleanup:"
+            df -kh /
             echo "Cleaning up RPM artifacts to free disk space..."
             rm -rf "${GITHUB_WORKSPACE}"/rpm_build_artifacts
             echo "Disk space after RPM cleanup:"
@@ -1284,6 +1286,8 @@ jobs:
             du -sh "${SRC_DIR}/../cloudberry"
 
             # Clean up source tarball to free disk space
+            echo "Disk space before source tarball cleanup:"
+            df -kh /
             echo "Cleaning up source tarball to free disk space..."
             rm -rf "${GITHUB_WORKSPACE}"/source_build_artifacts
             echo "Disk space after source tarball cleanup:"