chore: Adding Kokoro configuration to run integration test against staging (#2189)

chore: Adding Kokoro configuration to run integration test against staging

Author: gauravpurohit06

.kokoro/build.sh

@@ -86,6 +86,22 @@ integration)
       verify
     RETURN_CODE=$?
     ;;
+integration-staging)
+    mvn -B ${INTEGRATION_TEST_ARGS} \
+      -ntp \
+      -Penable-integration-tests \
+      -Djava.net.preferIPv4Stack=true \
+      -DtrimStackTrace=false \
+      -Dclirr.skip=true \
+      -Denforcer.skip=true \
+      -Dmaven.main.skip=true \
+      -Dspanner.gce.config.server_url=https://staging-wrenchworks.sandbox.googleapis.com \
+      -Dspanner.testenv.instance=projects/span-cloud-testing/instances/gaurav-test-instance \
+      -Dspanner.gce.config.project_id=span-cloud-testing
+      -fae \
+      verify
+    RETURN_CODE=$?
+    ;;
 graalvm)
     # Run Unit and Integration Tests with Native Image
     mvn test -Pnative -Penable-integration-tests

.kokoro/nightly/integration-staging.cfg

@@ -0,0 +1,32 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+  key: "TRAMPOLINE_IMAGE"
+  value: "gcr.io/cloud-devrel-kokoro-resources/java8"
+}
+
+env_vars: {
+  key: "JOB_TYPE"
+  value: "integration-staging"
+}
+# TODO: remove this after we've migrated all tests and scripts
+env_vars: {
+  key: "GCLOUD_PROJECT"
+  value: "java-docs-samples-testing"
+}
+
+env_vars: {
+  key: "GOOGLE_CLOUD_PROJECT"
+  value: "java-docs-samples-testing"
+}
+
+env_vars: {
+  key: "GOOGLE_APPLICATION_CREDENTIALS"
+  value: "secret_manager/java-it-service-account"
+}
+
+env_vars: {
+  key: "SECRET_MANAGER_KEYS"
+  value: "java-it-service-account"
+}