chore: use strict-image-heap only in image A

Author: diegomarquezp

.kokoro/build.sh

@@ -115,6 +115,11 @@ graalvm)
     mvn -B ${INTEGRATION_TEST_ARGS} -ntp -Pnative -Penable-integration-tests test "-Dtest=com.google.cloud.spanner.jdbc.it.**"
     RETURN_CODE=$?
     ;;
+graalvmA)
+    # Run Unit and Integration Tests with Native Image A.
+    NATIVE_IMAGE_OPTIONS="--strict-image-heap" mvn -B ${INTEGRATION_TEST_ARGS} -ntp -Pnative -Penable-integration-tests test "-Dtest=com.google.cloud.spanner.jdbc.it.**"
+    RETURN_CODE=$?
+    ;;
 samples)
     SAMPLES_DIR=samples
     # only run ITs in snapshot/ on presubmit PRs. run ITs in all 3 samples/ subdirectories otherwise.

.kokoro/presubmit/graalvm-native-a.cfg

@@ -8,7 +8,7 @@ env_vars: {
 
 env_vars: {
   key: "JOB_TYPE"
-  value: "graalvm"
+  value: "graalvmA"
 }
 
 # TODO: remove this after we've migrated all tests and scripts

src/test/resources/META-INF/native-image/com.google.cloud/google-cloud-spanner-jdbc/native-image.properties

@@ -1 +1 @@
-#Args=--strict-image-heap
+Args=--initialize-at-build-time=com.google.cloud.spanner.jdbc.it