For those using Docker-Desktop there are a few additional steps needed to get things working with FlexDeploy.
Enable Daemon on 2375
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Docker Desktop will need to restart afterwards.
Update FlexDeploy Topology
You will then need to configure the host and port, localhost and 2375 by default, on your Environment Instance.
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After those updates you can now build images and run containers like you could with any linux based Docker installation.