ENH: [CI / Docker]: Create a workflow to temporarly build docker images in case dockerfiles are modified

[younesbelkada]

Hi !

I would like to enhance the current way of testing docker build workflow, right now I need to manually change the rules for triggering the build docker image job to test if a PR leads to potential failure on docker build. In this PR I propose to simply trigger a simple workflow that just builds (without pushing) docker images that are modified by a PR

cc @pacman100 @BenjaminBossan

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[younesbelkada]

@glegendre01 do you think it's ok to move forward with this new workflow?

[BenjaminBossan]

In general, LGTM, thanks for adding this useful feature.

A minor concern I have is about adding this new GH action. Could it be a possible security concern? Maybe it's a non-issue, it was just something that crossed my mind.

[younesbelkada]

Thanks for the review!
I think that it should be all good as we don't push any docker image using that workflow and we use a GHA pinned on a specific commit (from @glegendre01 comment), in any case all PRs needs a maintainer approval before running the CI so we should be careful when reviewing PRs where we have some doubts (by pinging @glegendre01 if we have some strong doubts 🙏 )

[younesbelkada]

Also I need to merge this PR before properly testing it as GH does not allow to add new workflow from PRs :D

[pacman100]

Thank you @younesbelkada, nice QoL update for contributors! 🤗