Introduce a build step to the build workflow

[MGaetan89]

Pull request

Description

This PR introduces a build step in the build workflow. All the existing tasks are now waiting for the build step to complete, before starting.
This may improve the time needed for the CI checks to complete, as the build is now only done once, and then shared amongst all the steps.

Note

As caches are only written when running on main, the impact of the PR won't be visible until it has been merged.

Changes made

• Self-explanatory

Checklist

• Your branch has been rebased onto the main branch.
• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).
• All pull request status checks pass.

[github-actions]

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