I created an App Engine project on Google Cloud Platform and followed a very basic quick start tutorial for Go, but when trying to deploy my app using gcloud app deploy it is looking like it's trying to deploy using Docker (flexible environment), whereas I want to deploy using the standard environment. How do I avoid Docker and deploy this app?
$ gcloud app deploy
<...>
Beginning deployment of service [default]...
╔════════════════════════════════════════════════════════════╗
╠═ Uploading 1 file to Google Cloud Storage ═╣
╚════════════════════════════════════════════════════════════╝
File upload done.
Updating service [default]...failed.
ERROR: (gcloud.app.deploy) Error Response: [9] Cloud build ... status: FAILURE.
Error ID: 581A171A.
Error type: BuildError.
Error message: 2019/07/25 23:59:26 Building from Go source in /tmp/staging/srv/gopath/src/<project_name>, with main package at <project_name>
2019/07/25 23:59:26 Building /tmp/staging/srv/gopath/src/<project_name>, saving to /tmp/staging/usr/local/bin/start
2019/07/25 23:59:30 Wrote build output to /builder/outputs/output
2019/07/25 23:59:30 Wrote output to /tmp/staging/usr/local/bin/start
2019/07/25 23:59:30 Making tarball /tmp/tar-out406385400/app.tar.gz
2019/07/25 23:59:31 Creating app image on GCR: <...>
2019/07/25 23:59:32 Failed to create app image on GCR: [/bin/appender.par --src-image us.gcr.io/gae-runtimes/go112:go112_20190613_1_12_6_RC00 --tarball /tmp/tar-out406385400/app.tar.gz --dst-image us.gcr.io/<project_name>/app-engine-tmp/app/ttl-2h:4d75e939-3879-42b5-8fec-da14ad651baf]: Traceback (most recent call last):
File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main
"__main__", fname, loader, pkg_name)
File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
exec code in run_globals
File "/bin/appender.par/__main__.py", line 90, in <module>
File "/bin/appender.par/__main__.py", line 79, in main
File "/bin/appender.par/containerregistry/client/v2_2/docker_session_.py", line 71, in __init__
File "/bin/appender.par/containerregistry/client/v2_2/docker_http_.py", line 198, in __init__
File "/bin/appender.par/containerregistry/client/v2_2/docker_http_.py", line 301, in _Refresh
containerregistry.client.v2_2.docker_http_.TokenRefreshException: Bad status during token exchange: 403
{"errors":[{"code":"DENIED","message":"Token exchange failed for project '<project_name>'. Access denied."}]}.
