cloud_to_prod_auth:default:php7:compute_engine_creds interop failure #12490
Description
From #12297:
Output:
Fatal error: Uncaught DomainException: Could not load the default credentials. Browse to https://developers.google.com/accounts/docs/application-default-credentials for more information in /var/local/git/grpc/src/php/vendor/google/auth/src/ApplicationDefaultCredentials.php:148
Stack trace:
#0 /var/local/git/grpc/src/php/tests/interop/interop_client.php(579): Google\Auth\ApplicationDefaultCredentials::getCredentials('https://www.goo...')
#1 /var/local/git/grpc/src/php/tests/interop/interop_client.php(618): _makeStub(Array)
#2 /var/local/git/grpc/src/php/tests/interop/interop_client.php(693): interop_main(Array)
#3 {main}
thrown in /var/local/git/grpc/src/php/vendor/google/auth/src/ApplicationDefaultCredentials.php on line 148