1.6.0

## Highlights


⌨️ denotes breaking CLI changes.

👩‍💻 denotes breaking API changes.

- Security
- Core
- Kubernetes

## What's Changed
* Stop importing Testing from ContainerTestSupport by @Hashim1999164 in https://github.com/apple/container/pull/2118
* [container]: add commit command by @saehejkang in https://github.com/apple/container/pull/1762
* Fix k8s list grouping for dual-role control-plane nodes by @Hokila in https://github.com/apple/container/pull/2315
* K8s plugin: support no CNI on create by @katiewasnothere in https://github.com/apple/container/pull/2277
* Remove machine user extension points, update machine docs. by @jglogan in https://github.com/apple/container/pull/2322
* Document build and test targets, and make local test runs self-contained by default (.test-data) by @michaelzhang114 in https://github.com/apple/container/pull/2288
* Skip unreadable entries in image list by @Hokila in https://github.com/apple/container/pull/2157
* Fix coverage generation target by @noah-thor in https://github.com/apple/container/pull/2353
* Fix `container system status` false negative under a Seatbelt sandbox. by @renlord in https://github.com/apple/container/pull/2316
* Add support for multi node k8s clusters by @katiewasnothere in https://github.com/apple/container/pull/2276
* Add a SWIFT_CONFIGURATION_EXTRA hook for extra swift build flags by @noah-thor in https://github.com/apple/container/pull/2354
* Fix container k8s examples in command-reference by @katiewasnothere in https://github.com/apple/container/pull/2355
* Correct coverage scope for unit tests by @noah-thor in https://github.com/apple/container/pull/2356
* Extract `container build` and `container builder` as a CLI plugin by @JaewonHur in https://github.com/apple/container/pull/2298
* CLI test: sync disk after file remove and before clean. by @jglogan in https://github.com/apple/container/pull/2366
* Extract ContainerBuild logic into a library by @JaewonHur in https://github.com/apple/container/pull/2370
* Fix `container image load` for sparse images. by @jglogan in https://github.com/apple/container/pull/2385
* K8s image load fix fqn tagging by @katiewasnothere in https://github.com/apple/container/pull/2384
* Fix built image loading, create command output, and help text in the Kubernetes plugin by @dkovba in https://github.com/apple/container/pull/2369
* Fix minor issues in K8s plugin by @JaewonHur in https://github.com/apple/container/pull/2372
* Use a custom entrypoint script for k8s container nodes by @katiewasnothere in https://github.com/apple/container/pull/2289
* Add DNS aliases and subtree aliases for container network attachments by @jglogan in https://github.com/apple/container/pull/2390
* ci: bump the github-actions group with 2 updates by @dependabot[bot] in https://github.com/apple/container/pull/2391
* Update container-builder-shim to 0.13.2. by @jglogan in https://github.com/apple/container/pull/2394
* Treat a missing log file as empty in container logs by @bryanmosley in https://github.com/apple/container/pull/2393
* Fix container log following when the log is empty by @i098 in https://github.com/apple/container/pull/2377
* Bump to use containerization 0.51.0 by @adityaramani in https://github.com/apple/container/pull/2396
* Fix the cluster delete command when node containers are missing by @dkovba in https://github.com/apple/container/pull/2397
* Update to latest containerization dependency 0.52.0 by @katiewasnothere in https://github.com/apple/container/pull/2407
* Build context fix, bump to containerization 0.52.1. by @jglogan in https://github.com/apple/container/pull/2415

## New Contributors
* @Hashim1999164 made their first contribution in https://github.com/apple/container/pull/2118
* @Hokila made their first contribution in https://github.com/apple/container/pull/2315
* @michaelzhang114 made their first contribution in https://github.com/apple/container/pull/2288
* @renlord made their first contribution in https://github.com/apple/container/pull/2316
* @bryanmosley made their first contribution in https://github.com/apple/container/pull/2393
* @i098 made their first contribution in https://github.com/apple/container/pull/2377

**Full Changelog**: https://github.com/apple/container/compare/1.5.0...1.6.0