chore: update substitutions

Author: kgala2

.ci/cloudbuild.yaml

@@ -13,6 +13,17 @@
 # limitations under the License.
 
 steps:
+  - id: check the private DNS zone and the private connection
+    name: gcr.io/cloud-builders/git
+    entrypoint: bash
+    args:
+    - '-c'
+    - |
+        apt-get update
+        apt-get install dnsutils -y
+        echo "dig ${_DNS_NAME} ..."
+        dig ${_DNS_NAME}
+
   - id: run integration tests
     name: python:${_VERSION}
     entrypoint: bash
@@ -109,6 +120,7 @@ availableSecrets:
 substitutions:
   _VERSION: ${_VERSION}
   _IP_TYPE: ${_IP_TYPE}
+  _DNS_NAME: ${_DNS_NAME}
 
 options:
   dynamicSubstitutions: true

tests/system/test_pymysql_connection.py

@@ -90,9 +90,11 @@ def create_sqlalchemy_engine(
 
 def test_pymysql_connection() -> None:
     """Basic test to get time from database."""
-    inst_conn_name = os.environ["MYSQL_PSA_CONNECTION_NAME"]
-    user = os.environ["MYSQL_PSA_USER"]
-    password = os.environ["MYSQL_PSA_PASS"]
+    inst_conn_name = os.environ.get(
+        "MYSQL_PSA_CONNECTION_NAME", os.environ["MYSQL_CONNECTION_NAME"]
+    )
+    user = os.environ.get("MYSQL_PSA_USER", os.environ["MYSQL_USER"])
+    password = os.environ.get("MYSQL_PSA_PASS", os.environ["MYSQL_PASS"])
     db = os.environ["MYSQL_DB"]
     ip_type = os.environ.get("IP_TYPE", "public")