readme: add section on job summaries

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

README.md

@@ -16,6 +16,7 @@ ___
 * [Usage](#usage)
   * [Path context](#path-context)
   * [Git context](#git-context)
+* [Summaries](#summaries)
 * [Customizing](#customizing)
   * [inputs](#inputs)
   * [outputs](#outputs)
@@ -138,6 +139,26 @@ another private repository for remote definitions, you can set the
           BUILDX_BAKE_GIT_AUTH_TOKEN: ${{ secrets.MYTOKEN }}
 ```
 
+## Summaries
+
+This action generates a [job summary](https://github.blog/2022-05-09-supercharging-github-actions-with-job-summaries/)
+that provides a detailed overview of the build execution. The summary shows an
+overview of all the steps executed during the build, including the build
+inputs, bake definition, and eventual errors.
+
+![build-push-action job summary](./.github/bake-summary.png)
+
+The summary also includes a link for downloading a build record archive with
+additional details about the build execution for all the bake targets,
+including build stats, logs, outputs, and more. The build record can be
+imported to Docker Desktop for inspecting the build in greater detail.
+
+Summaries are enabled by default, but can be disabled with the
+`DOCKER_BUILD_NO_SUMMARY` [environment variable](#environment-variables).
+
+For more information about summaries, refer to the
+[documentation](https://docs.docker.com/go/build-summary/).
+
 ## Customizing
 
 ### inputs