CI: Add PG version comparison to binary swap check

The binary swap workflow previously only reported catalog version
information when comparing baseline and current builds. This made it
difficult to see at a glance which PostgreSQL kernel minor version
each build was based on.

Extract the underlying PostgreSQL kernel version from both baseline
and current installs via `pg_config --version`. Display the comparison
in the terminal log alongside the existing catalog version check, and
include it in the GitHub Step Summary report for better visibility
during PG minor version upgrades (e.g. 14.4 to 14.5).

Author: tuhaihe

.github/workflows/binary-swap-check.yml

@@ -565,6 +565,11 @@ jobs:
           echo "$CATALOG_VERSION"
           echo "BASELINE_CATALOG_VERSION=$CATALOG_VERSION" >> "$GITHUB_ENV"
 
+          echo "Baseline PostgreSQL Kernel Version:"
+          PG_VERSION=$("${BASELINE_INSTALL_DIR}/bin/pg_config" --version 2>/dev/null || echo "N/A")
+          echo "$PG_VERSION"
+          echo "BASELINE_PG_VERSION=$PG_VERSION" >> "$GITHUB_ENV"
+
           ls -la "${BASELINE_INSTALL_DIR}"
 
       - name: Install Current RPM
@@ -611,6 +616,11 @@ jobs:
           echo "$CATALOG_VERSION"
           echo "CURRENT_CATALOG_VERSION=$CATALOG_VERSION" >> "$GITHUB_ENV"
 
+          echo "Current PostgreSQL Kernel Version:"
+          PG_VERSION=$("${CURRENT_INSTALL_DIR}/bin/pg_config" --version 2>/dev/null || echo "N/A")
+          echo "$PG_VERSION"
+          echo "CURRENT_PG_VERSION=$PG_VERSION" >> "$GITHUB_ENV"
+
           ls -la "${CURRENT_INSTALL_DIR}"
 
       - name: Setup pg_regress
@@ -712,15 +722,18 @@ jobs:
             echo "No regression diffs found - test passed"
           fi
 
-      - name: Final Catalog Version Summary
+      - name: Final Version Summary
         if: always()
         run: |
           echo "=== Catalog Version Comparison ==="
           echo "Baseline Catalog Version: ${BASELINE_CATALOG_VERSION:-N/A}"
           echo "Current Catalog Version:  ${CURRENT_CATALOG_VERSION:-N/A}"
-          echo ""
           echo "Catalog Status: $([[ "$BASELINE_CATALOG_VERSION" == "$CURRENT_CATALOG_VERSION" ]] && echo "✅ IDENTICAL" || echo "🔍 DIFFERENT")"
-          echo "=== Comparison completed ==="
+          echo ""
+          echo "=== PostgreSQL Kernel Version Comparison ==="
+          echo "Baseline PG Version: ${BASELINE_PG_VERSION:-N/A}"
+          echo "Current PG Version:  ${CURRENT_PG_VERSION:-N/A}"
+          echo "PG Kernel Status: $([[ "$BASELINE_PG_VERSION" == "$CURRENT_PG_VERSION" ]] && echo "✅ IDENTICAL" || echo "🔍 DIFFERENT")"
 
       - name: Generate Report
         if: always()
@@ -749,6 +762,10 @@ jobs:
           **Baseline Catalog Version**: ${BASELINE_CATALOG_VERSION}
           **Current Catalog Version**: ${CURRENT_CATALOG_VERSION}
 
+          ## PostgreSQL Kernel Version
+          **Baseline PG Version**: ${BASELINE_PG_VERSION}
+          **Current PG Version**: ${CURRENT_PG_VERSION}
+
           ${MESSAGE}
           
           EOF