[doc] Extend v0.10.0rc announcement with Docker image

release_notes/v0.10.0rc.md

@@ -5,11 +5,21 @@ Hey fellow testers and early-adopters!
 We are pleased to announce Silkaj v0.10.0 release candidate, and we would be happy to receive feedback before releasing it as stable.
 
 ## Pre-release installation
-To install this pre-release version from PyPI, run following command:
+You install this pre-release version from PyPI or from a Docker image.
+To install the Python package, run following command:
 ```sh
 pip3 install silkaj --user --upgrade --pre
 ```
 
+To [install and run Silkaj from the Docker image](doc/docker.md):
+```bash
+sudo docker pull registry.duniter.org/clients/python/silkaj/release/pip:v0.10.0rc0
+```
+Run Silkaj from outside the image:
+```bash
+sudo docker run -it registry.duniter.org/clients/python/silkaj/release/pip:v0.10.0rc0 silkaj info
+```
+
 ## Tests
 Please test it globally, and check [v0.10.0 milestone short summary](https://git.duniter.org/clients/python/silkaj/-/milestones/9#code) which contains the changes which have been implemented during this development cycle.
 Pay a special attention to the newly introduced revocation command.