Following method all fails with running the agent in Docker.

docker run dockeragent:latest --once

    command: "--once"

in docker-compose.yaml

          args:
            - '--once'

in k8s deployment

Error message from Docker:

./env.sh: line 44: --once: invalid variable name

Error message from k8s pod:

./env.sh: line 44: --once: bad substitution

This worked fine up until v2.214.1 and then it's broken with v2.217.0.
Since docker image run always download latest version, all our agents in Docker are broken.

Docker image was built using instructions on this page: https://learn.microsoft.com/en-us/azure/devops/pipelines/agents/docker?view=azure-devops#linux