Context

!5933 (merged) revamped the docker-compose files but used the old convention for the PROTOCOL environment variable. Just before it was merged, !6473 (merged) renamed the Octez executables and, as a consequence, the PROTOCOL environment variable should no longer contain the protocol number.

Manually testing the MR

Build Docker images (e.g. by triggering the Docker job in the CI)
edit scripts/docker/kathmandu.yml to replace tezos/tezos:latest with the name of the image you just built
run docker-compose up -f scripts/docker/kathmandu.yml

(Note: I actually didn't test myself yet…)

Checklist

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