set application_credentials env variable

Author: mpeddada1

.kokoro/build.sh

@@ -74,10 +74,11 @@ graalvmA)
     # Run Unit and Integration Tests with Native Image
     echo "HELLOOOO"
     bash .kokoro/populate-secrets.sh
-    if [[ ! -z "${GOOGLE_APPLICATION_CREDENTIALS}" && "${GOOGLE_APPLICATION_CREDENTIALS}" != /* ]]; then
-      echo "HELLO1"
-      export GOOGLE_APPLICATION_CREDENTIALS=$(realpath ${KOKORO_GFILE_DIR}/${GOOGLE_APPLICATION_CREDENTIALS})
-    fi
+    export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/${GOOGLE_APPLICATION_CREDENTIALS}
+#    if [[ ! -z "${GOOGLE_APPLICATION_CREDENTIALS}" && "${GOOGLE_APPLICATION_CREDENTIALS}" != /* ]]; then
+#      echo "HELLO1"
+#      export GOOGLE_APPLICATION_CREDENTIALS=$(realpath ${KOKORO_GFILE_DIR}/${GOOGLE_APPLICATION_CREDENTIALS})
+#    fi
     mvn -B ${INTEGRATION_TEST_ARGS} -ntp -Pnative -Pnative-test test -pl 'oauth2_http'
     RETURN_CODE=$?
     ;;