docs(ci): manual for gitlab registry usage

DEVELOPERS.md

@@ -31,11 +31,7 @@ La documentation est générée avec Mkdocs, pandoc et LaTeX.
 
 ### pour le développement
 
- * nodejs / npm
- * python (pour mkdocs)
- * wine (pour Electron / windows)
- * pandoc (pour la documentation PDF)
- * une distribution LaTeX, par exemple texlive (pour la documentation PDF)
+Voir la section *Requirements* du fichier `README.md`.
 
 ### pour l'exécution
 

README.md

@@ -31,9 +31,9 @@ sudo apt install pandoc texlive latexmk texlive-latex-extra texlive-bibtex-extra
 
 #### Using docker container
 
-Download and use the following docker image: https://hub.docker.com/repository/docker/geaucassiopee/ci-cd-cross-platform-webapp
-
-More details on how to use it on vscode are available at https://forgemia.inra.fr/cassiopee/cassiopee2-integration
+Use the DockerFile provided at the root of this repository. This repository also
+provide a `.devcontainer` configuration for developing nghyd in vscode
+(See https://code.visualstudio.com/docs/devcontainers/containers).
 
 ### Install dependencies
 
@@ -206,7 +206,38 @@ To draw the diagram:
 npm run viz
 ```
 
-## Caveats
+### CI/CD docker image
+
+Gitlab CI/CD uses a docker image created with the `DockerFile` located at the root
+of this repository. This image needs to be pushed on the Gitlab registry in order to
+be used by the CI/CD.
+
+#### Requirements
+
+You need to have Docker installed on your computer (See: https://docs.docker.com/get-docker/).
+On Windows, you first need to install a Linux distro under WSL2 (See
+https://learn.microsoft.com/en-us/windows/wsl/install).
+
+#### Build and push container images to the Container Registry
+
+This notice is inspired from
+https://docs.gitlab.com/ee/user/packages/container_registry/build_and_push_images.html.
+
+You first need to create an access token (personal or project token):
+
+Go to https://gitlab.irstea.fr/-/profile/personal_access_tokens
+and create a token with a minimum scope `write_registry` and `read_registry`.
+
+Open a terminal in the root folder of this repository on your local machine,
+and type (with `<token name>` and `<token value>` the credentials
+of the access token):
+
+```
+docker login registry.forgemia.inra.fr -u <token name> -p <token value>
+docker build -t registry.forgemia.inra.fr/cassiopee/nghyd .
+docker push registry.forgemia.inra.fr/cassiopee/nghyd
+```
+
 
 ### Deployment