Update validation workflow

Author: tuhaihe

.github/workflows/sandbox-validation.yml

@@ -92,8 +92,23 @@ jobs:
           ./run.sh -c ${{ matrix.version }}
 
           sleep 60  # Wait for containers to initialize
+        timeout-minutes: 30
+
+      - name: Test database operations
+        run: |
+          echo "Waiting for database readiness (up to 60s)..."
+          for i in {1..12}; do
+            if docker exec -u gpadmin cbdb-cdw bash -l -c "pg_isready -h localhost -p 5432 -U gpadmin" >/dev/null 2>&1; then
+              echo "Database is ready."
+              break
+            fi
+            if [ "$i" -eq 12 ]; then
+              echo "Database did not become ready in time."
+              exit 1
+            fi
+            sleep 5
+          done
 
-          # Test basic database operations
           echo "Testing database version..."
           docker exec -u gpadmin cbdb-cdw bash -l -c "psql -c 'SELECT version()'"
 
@@ -104,7 +119,6 @@ jobs:
           docker exec -u gpadmin cbdb-cdw bash -l -c "psql -c 'SELECT * FROM pg_available_extensions'"
 
           echo "✅ Single node test (${{ matrix.version }}) completed successfully"
-        timeout-minutes: 30
 
       - name: Check container logs on failure
         if: failure()
@@ -150,16 +164,21 @@ jobs:
           sleep 120  # Wait for containers to initialize
         timeout-minutes: 30
 
-      - name: Test SSH connectivity between nodes
-        run: |
-          echo "Testing SSH connectivity from coordinator to all nodes..."
-          docker exec -u gpadmin cbdb-cdw bash -l -c "ssh -o StrictHostKeyChecking=no sdw1 'hostname'"
-          docker exec -u gpadmin cbdb-cdw bash -l -c "ssh -o StrictHostKeyChecking=no sdw2 'hostname'"
-          docker exec -u gpadmin cbdb-cdw bash -l -c "ssh -o StrictHostKeyChecking=no scdw 'hostname'"
-          echo "✅ SSH connectivity test passed"
-
       - name: Test database operations
         run: |
+          echo "Waiting for database readiness (up to 60s)..."
+          for i in {1..12}; do
+            if docker exec -u gpadmin cbdb-cdw bash -l -c "pg_isready -h localhost -p 5432 -U gpadmin" >/dev/null 2>&1; then
+              echo "Database is ready."
+              break
+            fi
+            if [ "$i" -eq 12 ]; then
+              echo "Database did not become ready in time."
+              exit 1
+            fi
+            sleep 5
+          done
+
           echo "Testing database version..."
           docker exec -u gpadmin cbdb-cdw bash -l -c "psql -c 'SELECT version()'"
 
@@ -170,7 +189,7 @@ jobs:
           docker exec -u gpadmin cbdb-cdw bash -l -c "psql -c 'SELECT * FROM pg_available_extensions'"
 
           echo "✅ Multi-node test (${{ matrix.version }}) completed successfully"
-      
+
       - name: Check all container logs on failure
         if: failure()
         run: |