CELLD_BUCKET=<fill-this-in>
S3_ENDPOINT=<fill-this-in>
AWS_REGION=<fill-this-in>
AWS_ACCESS_KEY_ID=<fill-this-in>
AWS_SECRET_ACCESS_KEY=<fill-this-in>

Set up celld on this VM by following the exe.dev recipe at https://exe-staging.dev/deploy/celld.md from top to bottom.

The values at the top of this message are mine:
- CELLD_BUCKET: an empty bucket, written `s3://name` ([get one](#get-a-bucket))
- S3_ENDPOINT: R2: `https://<ACCOUNT_ID>.r2.cloudflarestorage.com`; Tigris: `https://t3.storage.dev`; Amazon S3: leave empty
- AWS_REGION: `auto` for R2 and Tigris; the bucket's region for Amazon S3
- AWS_ACCESS_KEY_ID: a key that can read and write that bucket, and nothing else
- AWS_SECRET_ACCESS_KEY: the key's secret
Ask me for any that still say <fill-this-in> before you need them.

The recipe's example VM name is my-celld. This VM's name is the output of `hostname`: use it wherever the recipe writes my-celld. Skip the step that creates the VM; you are on it.

You are done when all of these are true. Check each one yourself:
- celld 0.6.2 serving a chat at `https://<vm>.exe.xyz/`, one Durable Object per room.
- Every write in your bucket before celld answers, with the bucket's keys in one private file.
- A message that survived restarting celld with an empty local cache.
- celld starting at boot and coming back after a crash.
- Nightly snapshots of the bucket, and one restored to prove it works.

Read the whole recipe, including the closed details. Follow "Install by
hand" first, skipping VM creation; the walkthrough is for the owner
afterwards. Do not run the later Restore or Update instructions.
Write the owner's five values into ~/celld/celld.env and never print the
secret key. Never overwrite an existing celld.env. The bucket must be
empty: if `~/celld/run rclone lsf celld:` lists anything, stop and ask
the owner, because celld treats everything in its bucket as its own.
Keep the VM private; do not run share set-public.
Check the health endpoint, a posted message, the same message after
restarting celld with an empty ~/celld/state, that celld.service and
celld-snapshot.timer are enabled, and the snapshot restore test.
Finish with https://<vm>.exe.xyz/, using this VM's name, and tell the
owner to edit ~/chat and run ~/celld/deploy ~/chat to ship changes.

Finish with the URLs I should open.