Fix CI test failures due to insufficient disk space

Clean up RPM and source tarball artifacts after installation/extraction
to free disk space for subsequent test execution.

Changes:
- Remove RPM artifacts after installation
- Remove source tarball after extraction
- Add disk space logging before/after cleanup for debugging

Author: tuhaihe

.github/workflows/build-cloudberry.yml

@@ -1233,6 +1233,22 @@ jobs:
             rpm -qi apache-cloudberry-db-incubating
           } 2>&1 | tee -a build-logs/details/rpm-installation.log
 
+          # Clean up downloaded RPM artifacts to free disk space
+          echo "=== Disk space before RPM cleanup ==="
+          echo "Human readable:"
+          df -kh /
+          echo "Exact KB:"
+          df -k /
+          echo "RPM artifacts size:"
+          du -sh "${{ github.workspace }}"/rpm_build_artifacts || true
+          echo "Cleaning up RPM artifacts to free disk space..."
+          rm -rf "${{ github.workspace }}"/rpm_build_artifacts
+          echo "=== Disk space after RPM cleanup ==="
+          echo "Human readable:"
+          df -kh /
+          echo "Exact KB:"
+          df -k /
+
       - name: Extract source tarball
         if: success() && needs.check-skip.outputs.should_skip != 'true'
         env:
@@ -1258,6 +1274,22 @@ jobs:
             du -sh "${SRC_DIR}/../cloudberry"
           } 2>&1 | tee -a build-logs/details/source-extraction.log
 
+          # Clean up source tarball to free disk space
+          echo "=== Disk space before source tarball cleanup ==="
+          echo "Human readable:"
+          df -kh /
+          echo "Exact KB:"
+          df -k /
+          echo "Source tarball artifacts size:"
+          du -sh "${{ github.workspace }}"/source_build_artifacts || true
+          echo "Cleaning up source tarball to free disk space..."
+          rm -rf "${{ github.workspace }}"/source_build_artifacts
+          echo "=== Disk space after source tarball cleanup ==="
+          echo "Human readable:"
+          df -kh /
+          echo "Exact KB:"
+          df -k /
+
       - name: Create Apache Cloudberry demo cluster
         if: success() && needs.check-skip.outputs.should_skip != 'true'
         env:
@@ -1385,6 +1417,7 @@ jobs:
             esac
 
             echo "Log file: $config_log"
+
             echo "=== End configuration $((i+1)) execution ==="
             echo ""
           done