Add runbook for deploying a test distribution

Author: jpraynaud

docs/runbook/README.md

@@ -18,4 +18,4 @@ This page gathers the available guides to operate a Mithril network.
 | **Manage SSH access to infrastructure** | [ssh-access](./ssh-access/README.md)                                   | Manage SSH access on the VM of the infrastructure for a user.             |
 | **Upgrade VM of infrastructure**        | [upgrade-vm](./upgrade-vm/README.md)                                   | Upgrade the VM of the infrastructure of a Mithril network.                |
 | **Create test Docker distribution**     | [test-docker-distribution](./test-docker-distribution/README.md)       | Create a custom test Docker distribution.                                 |
-
+| **Deploy a test network**               | [test-docker-distribution](./test-deploy-network/README.md)       | Manually deploy a test distribution to a test Mithril network.            |

docs/runbook/test-deploy-network/README.md

@@ -0,0 +1,29 @@
+# Manually deploy a test distribution to a test Mithril network.
+
+## Introduction
+
+From time to time, we may need to deploy manually on a test Mithril network a test distribution in order to test unreleased features independently from the regular [release process](https://mithril.network/doc/adr/3). In that case, we have the opportunity to manually deploy to a pre-configured network a specific distribution.
+
+## Run the associated 'Test network deploy' GitHub Actions workflow
+
+Go to the page of the workflow with your browser: [Docker image test](https://github.com/input-output-hk/mithril/actions/workflows/test-deploy.yml)
+
+Then, click on the **Run workflow** button:
+
+![Run workflow button](./img/run-workflow-button.png)
+
+Then fill the form to manually run the workflow:
+
+![Run workflow form](./img/run-workflow-form.png)
+
+> [!WARNING]  
+> - The **Mithril image id** of the of the distribution to deploy must be published on the [package registry](https://github.com/orgs/input-output-hk/packages?repo_name=mithril)
+
+> [!CAUTION]
+> It is highly recommended to run with the **Dry run** option checked at first and make sure that the process works as expected
+> The deployment of a distribution can lead to irreversible damages or loss for the network
+
+
+The result should look like this in the GitHub Actions:
+
+![Run workflow result](./img/run-workflow-result.png)