[Feature]: Add optional container user namespace for Ryku

[scorpionknifes]

Problem

I'm working with a CI/CD environment that requires me to run Ryku with privileged and user namespace to be 'host'

I'm getting the following error when running Ryku in privileged mode, I need to manually pass in a user namespace.

docker: Error response from daemon: privileged mode is incompatible to user namespaces. You must run the container in the host namespace when running privileged mode'

Example docker cli:

docker run --privileged --userns host -it  -v /var/run/docker.sock:/var/run/docker.sock -p 8080 testcontainers/ryuk:0.8.1 sh

Solution

Create a option or config/env such as TESTCONTAINERS_RYUK_CONTAINER_USER_NAMESPACE to be configured to pass in as userns for Ryku

I'm currently have it successfully running with the following changes: mx51@59dc7da

Benefit

Allow users to run Ryku in privileged mode with host namespace

Alternatives

Pass it in with an option to create a container.

Would you like to help contributing this feature?

Yes

[stevenh]

Looks reasonable to me