docs/deprecated: Deprecate Container fields in image inspect

See moby/moby#46939

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

docs/deprecated.md

@@ -50,6 +50,7 @@ The table below provides an overview of the current status of deprecated feature
 
 | Status     | Feature                                                                                                                            | Deprecated | Remove |
 |------------|------------------------------------------------------------------------------------------------------------------------------------|------------|--------|
+| Deprecated | [`Container` and `ContainerConfig` fields in Image inspect](#image-container-fields)                                               | v25.0      | v26.0  |
 | Deprecated | [Deprecate legacy API versions](#deprecate-legacy-api-versions)                                                                    | v25.0      | v26.0  |
 | Deprecated | [Container short ID in network Aliases field](#container-short-id-in-network-aliases-field)                                        | v25.0      | v26.0  |
 | Deprecated | [IsAutomated field, and "is-automated" filter on docker search](#isautomated-field-and-is-automated-filter-on-docker-search)       | v25.0      | v26.0  |
@@ -110,6 +111,19 @@ The table below provides an overview of the current status of deprecated feature
 | Removed    | [`--run` flag on `docker commit`](#--run-flag-on-docker-commit)                                                                    | v0.10      | v1.13  |
 | Removed    | [Three arguments form in `docker import`](#three-arguments-form-in-docker-import)                                                  | v0.6.7     | v1.12  |
 
+### `Container` and `ContainerConfig` fields in Image inspect
+
+**Deprecated in Release: v25.0**
+**Target For Removal In Release: v26.0**
+
+The `Container` and `ContainerConfig` fields returned by `docker inspect` are
+mostly an implementation detail of the classic (non-buildkit) image builder.
+These informations are not portable and are empty anyway when using the
+buildkit based builder (enabled by default since v23.0).
+These fields are deprecated in v25.0 and will be omitted starting from v26.0.
+If image configuration of an image is needed, it should be obtained from the
+`Config` field.
+
 ### Deprecate legacy API versions
 
 **Deprecated in Release: v25.0**