Docs: add Image Repository search

doc/api/container_registry.md

@@ -18,6 +18,7 @@ GET /projects/:id/registry/repositories
 | --------- | ---- | -------- | ----------- |
 | `id`      | integer/string | yes | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) accessible by the authenticated user. |
 | `tags`      | boolean | no | If the parameter is included as true, each repository will include an array of `"tags"` in the response. |
+| `name`      | string | no | Returns a list of repositories with a name that matches the value. ([Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/29763) in GitLab 13.0). |
 
 ```shell
 curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/5/registry/repositories"
@@ -58,6 +59,7 @@ GET /groups/:id/registry/repositories
 | --------- | ---- | -------- | ----------- |
 | `id`      | integer/string | yes | The ID or [URL-encoded path of the group](README.md#namespaced-path-encoding) accessible by the authenticated user. |
 | `tags`      | boolean | no | If the parameter is included as true, each repository will include an array of `"tags"` in the response. |
+| `name`      | string | no | Returns a list of repositories with a name that matches the value. ([Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/29763) in GitLab 13.0). |
 
 ```shell
 curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/groups/2/registry/repositories?tags=1"

doc/user/packages/container_registry/index.md

@@ -8,6 +8,7 @@
 >   login to GitLab's Container Registry.
 > - Multiple level image names support was added in GitLab 9.1.
 > - The group level Container Registry was [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/23315) in GitLab 12.10.
+> - Searching by image repository name was [introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/31322) in GitLab 13.0.
 
 NOTE: **Note:**
 This document is the user guide. To learn how to enable GitLab Container
@@ -60,6 +61,7 @@ Navigate to your project's **{package}** **Packages & Registries > Container Reg
 This view will:
 
 - Show all the image repositories that belong to the project.
+- Allow you to filter image repositories by their name.
 - Allow you to [delete](#delete-images-from-within-gitlab) one or more image repository.
 - Allow you to navigate to the image repository details page.
 - Show a **Quick start** dropdown with the most common commands to log in, build and push