Based on:

Create new Durable Reduced Availability bucket, use hostname as the bucket name:

gsutil mb -c DRA gs://

To use standard bucket, remove "-c DRA" above.

Change the ACL for all objects to be publicly accessible:

gsutil -m acl set -R -a public-read gs://

Set default ACL for new objects:

gsutil defacl set public-read gs://

Upload content to the bucket:

gsutil -m rsync -d -r ~/public_html  gs://

Turn off object versioning on the bucket:

gsutil versioning set off gs://

Set index.html as the root directory index and 404.html as 404 error page:

gsutil web set -m index.html -e 404.html gs://