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21th chunk of `content/manuals/build/release-notes.md`
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- Additional build context configuration is now supported in Compose files via `x-bake`. [docker/buildx#1256](https://github.com/docker/buildx/issues/1256)
- Inspecting builder now shows current driver options configuration. [docker/buildx#1003](https://github.com/docker/buildx/issues/1003),
  [docker/buildx#1066](https://github.com/docker/buildx/issues/1066)

### Updates

- Updated the Compose Specification to 1.4.0. [docker/buildx#1246](https://github.com/docker/buildx/issues/1246),
  [docker/buildx#1251](https://github.com/docker/buildx/issues/1251)

### Bug fixes and enhancements

- The `buildx ls` command output has been updated with better access to errors
  from different builders. [docker/buildx#1109](https://github.com/docker/buildx/issues/1109)
- The `buildx create` command now performs additional validation of builder parameters
  to avoid creating a builder instance with invalid configuration. [docker/buildx#1206](https://github.com/docker/buildx/issues/1206)
- The `buildx imagetools create` command can now create new multi-platform images
  even if the source subimages are located on different repositories or
  registries. [docker/buildx#1137](https://github.com/docker/buildx/issues/1137)
- You can now set the default builder config that is used when creating
  builder instances without passing custom `--config` value. [docker/buildx#1111](https://github.com/docker/buildx/issues/1111)
- Docker driver can now detect if `dockerd` instance supports initially
  disabled Buildkit features like multi-platform images. [docker/buildx#1260](https://github.com/docker/buildx/issues/1260),
  [docker/buildx#1262](https://github.com/docker/buildx/issues/1262)
- Compose files using targets with `.` in the name are now converted to use `_`
  so the selector keys can still be used in such targets. [docker/buildx#1011](https://github.com/docker/buildx/issues/1011)
- Included an additional validation for checking valid driver configurations. [docker/buildx#1188](https://github.com/docker/buildx/issues/1188),
  [docker/buildx#1273](https://github.com/docker/buildx/issues/1273)
- The `remove` command now displays the removed builder and forbids removing
  context builders. [docker/buildx#1128](https://github.com/docker/buildx/issues/1128)
- Enable Azure authentication when using Kubernetes driver. [docker/buildx#974](https://github.com/docker/buildx/issues/974)
- Add tolerations handling for kubernetes driver. [docker/buildx#1045](https://github.com/docker/buildx/issues/1045)
  [docker/buildx#1053](https://github.com/docker/buildx/issues/1053)
- Replace deprecated seccomp annotations with `securityContext` in the `kubernetes` driver.
  [docker/buildx#1052](https://github.com/docker/buildx/issues/1052)
- Fix panic on handling manifests with nil platform. [docker/buildx#1144](https://github.com/docker/buildx/issues/1144)
- Fix using duration filter with `prune` command. [docker/buildx#1252](https://github.com/docker/buildx/issues/1252)
- Fix merging multiple JSON files on Bake definition. [docker/buildx#1025](https://github.com/docker/buildx/issues/1025)
- Fix issues with implicit builder created from Docker context had invalid
  configuration or dropped connection. [docker/buildx#1129](https://github.com/docker/buildx/issues/1129)
- Fix conditions for showing no-output warning when using named contexts. [docker/buildx#968](https://github.com/docker/buildx/issues/968)
- Fix duplicating builders when builder instance and docker context have the
  same name. [docker/buildx#1131](https://github.com/docker/buildx/issues/1131)
- Fix printing unnecessary SSH warning logs. [docker/buildx#1085](https://github.com/docker/buildx/issues/1085)
- Fix possible panic when using an empty variable block with Bake JSON
  definition. [docker/buildx#1080](https://github.com/docker/buildx/issues/1080)
- Fix image tools commands not handling `--builder` flag correctly. [docker/buildx#1067](https://github.com/docker/buildx/issues/1067)
- Fix using custom image together with rootless option. [docker/buildx#1063](https://github.com/docker/buildx/issues/1063)
Title: Docker Buildx Updates, Bug Fixes, and Enhancements
Summary
This section details updates to Docker Buildx, including improvements to Compose file configurations via `x-bake`, displaying driver options during builder inspection, and updating the Compose Specification to 1.4.0. It also covers bug fixes and enhancements such as improved error access in `buildx ls`, validation of builder parameters in `buildx create`, enhanced multi-platform image creation, default builder config settings, Docker driver detection of Buildkit features, Compose file target conversion, driver configuration validation, `remove` command updates, Azure authentication and tolerations handling for Kubernetes driver, and various fixes addressing panics, duration filters, JSON merging, implicit builder issues, warnings, builder duplication, SSH warnings, Bake JSON definitions, image tools commands, and rootless option usage.