Run containerdebug as a background job (#881)

* Run containerdebug as a background job

See stackabletech/issues#527

* Direct containerdebug logs to disk

* Save containerdebug state too

* update test and changelog

* update Cargo.nix

* fix typo

* fix containerdebug log dir

* another fix after running the tests

* revert env var removal

---------

Co-authored-by: Razvan-Daniel Mihai <84674+razvan@users.noreply.github.com>

CHANGELOG.md

@@ -8,13 +8,15 @@ All notable changes to this project will be documented in this file.
 
 - The lifetime of auto generated TLS certificates is now configurable with the role and roleGroup
   config property `requestedSecretLifetime`. This helps reduce frequent Pod restarts ([#892]).
+- Run a `containerdebug` process in the background of each Zookeeper container to collect debugging information ([#881]).
 
 ### Fixed
 
 - BREAKING: Use distinct ServiceAccounts for the Stacklets, so that multiple Stacklets can be
   deployed in one namespace. Existing Stacklets will use the newly created ServiceAccounts after
   restart ([#889]).
 
+[#881]: https://github.com/stackabletech/zookeeper-operator/pull/881
 [#889]: https://github.com/stackabletech/zookeeper-operator/pull/889
 [#892]: https://github.com/stackabletech/zookeeper-operator/pull/892