Add query debugging

Author: kesmit13

.github/workflows/coverage.yml

@@ -53,6 +53,7 @@ jobs:
           # used to create the database and the generated database name will
           # be applied to the above URL.
           SINGLESTOREDB_INIT_DB_URL: "root:[email protected]:3307"
+          SINGLESTOREDB_DEBUG_QUERIES: "1"
 
       - name: Run MySQL protocol tests
         run: |