Deploy an image to a Rivet cluster

A deploy is a local build, one upload, and two Code Mode operations run through the execute tool. It needs Docker and a shell. It does not need the Rivet CLI or any other login.

Before starting

1. Confirm the session can deploy. If search does not list rivet.deploy.prepare, the session is read-only or is pinned to a project or namespace, and the deploy cannot run from here. Say so instead of retrying.
2. Pick the cluster. Run return (await rivet.cloud.v2.clusters.list()).items; in execute and use the cluster field of the one to deploy to, which is its name. On a connection pinned to a cluster, rivet.context() reports it, and cluster is left out of every call below.

Steps

1. Build and measure the image in the shell. The platform must be linux/amd64.

   docker build --platform linux/amd64 -t app .
   docker image save app -o image.tar
   wc -c < image.tar                        # content_length
   openssl md5 -binary image.tar | base64   # content_md5