Avoid duplicated steps in the GitHub Actions

[christophe-f]

What do you want to improve?

Run steps only once

What is the current behavior?

We are running the same steps several times.

What is the new behavior?

Run same steps only once. For example we are having yarn install twice. In the CI GH Action and the Dockerfile.
We also build the image twice. In the CI GH Action and the docker-build.yaml action.

Building the docker image should be only from the main branch

We could also only run the CI (

We might have more duplications

⚠️ Is this a breaking change?

Put an x in the boxes that apply

• Yes
• No
• Don't know