buildx/docs/reference
Akihiro Suda add4301ed6
kubernetes: replace deprecated seccomp annotations with securityContext
Kubernetes added the official `securityContext.seccompProfile` support in Kubernetes 1.19.
Seccomp is still disabled by default.

The legacy `container.seccomp.security.alpha.kubernetes.io/<PODNAME>` annotation has been deprecated and will be unsupported in Kubernetes 1.25.
https://kubernetes.io/docs/tutorials/security/seccomp/

A test cluster can be created with the following minikube command:
```
minikube start --feature-gates SeccompDefault=true --extra-config kubelet.seccomp-default=true
```

Related to moby/buildkit PR 2782

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
..
buildx.md docs: update cli-docs-tool to v0.4.0
buildx_bake.md docs: small fixes
buildx_build.md dockerfile: update frontend to 1.4
buildx_create.md kubernetes: replace deprecated seccomp annotations with securityContext
buildx_du.md docs: update cli-docs-tool to v0.4.0
buildx_imagetools.md imagetools inspect: add --format flag
buildx_imagetools_create.md imagetools inspect: add --format flag
buildx_imagetools_inspect.md imagetools inspect: missing manifest digest for manifest-list (json)
buildx_inspect.md docs: update cli-docs-tool to v0.4.0
buildx_install.md docs: reference docs updates
buildx_ls.md docs: lint
buildx_prune.md docs: update cli-docs-tool to v0.4.0
buildx_rm.md docs: update cli-docs-tool to v0.4.0
buildx_stop.md docs: update cli-docs-tool to v0.4.0
buildx_uninstall.md docs: reference docs updates
buildx_use.md docs: update cli-docs-tool to v0.4.0
buildx_version.md docs: lint