Interesting .. I didn't know about Jenkins API.

Also run your play in debug mode -vv and add this task output to the question so we can see what happened there.

Try to run your telnet command without ansible and verify it's expecting exactly those 6 responses .. seems that expect is still awaiting for one of those inputs to be rendered until timeout.

Because RUN apt-get install .. will create an intermediate container , run commands then commit it to the final image. In your example, first you're starting MySQL server creating data then commiting to the final image but then running a second server with a new intermediate container and empty database.