Update README.md adding small sentence about scratch images (bitnami#…

…53229)

* Update README.md adding small sentence about scratch images

Signed-off-by: Carlos Rodríguez Hernández <carlosrh@vmware.com>

* Update README.md

Signed-off-by: Carlos Rodríguez Hernández <carlosrh@vmware.com>

---------

Signed-off-by: Carlos Rodríguez Hernández <carlosrh@vmware.com>

README.md

@@ -10,7 +10,7 @@ Popular applications, provided by [Bitnami](https://bitnami.com), containerized
 * Bitnami closely tracks upstream source changes and promptly publishes new versions of this image using our automated systems.
 * With Bitnami images the latest bug fixes and features are available as soon as possible.
 * Bitnami containers, virtual machines and cloud images use the same components and configuration approach - making it easy to switch between formats based on your project needs.
-* All our images are based on [minideb](https://github.com/bitnami/minideb) a minimalist Debian based container image that gives you a small base container image and the familiarity of a leading Linux distribution.
+* All our images are based on [**minideb**](https://github.com/bitnami/minideb) -a minimalist Debian based container image that gives you a small base container image and the familiarity of a leading Linux distribution- or **scratch** -an explicitly empty image-.
 * All Bitnami images available in Docker Hub are signed with [Docker Content Trust (DCT)](https://docs.docker.com/engine/security/trust/content_trust/). You can use `DOCKER_CONTENT_TRUST=1` to verify the integrity of the images.
 * Bitnami container images are released on a regular basis with the latest distribution packages available.