New debug-benchmark mode to inspect docker containers before they're deleted

[franz1981]

Currently Techempower benchmarks can/won't delete docker containers depending if debug/benchmark mode is used to run it: it won't help collecting tracing/profiling and/or other stats collected by containers on test stop.

It would be nice to keep the containers opened in order to let users to inspect whatever they've collected and/or still interact with them before being destroyed. I'm opened to other solutions, obviously, but I hope I've correctly explained what's the problem we're facing.

Many thanks!!