Add "Composer Lint" job to CI pipeline

[phansys]

Applies composer-lint workflow from doctrine/.github.

[ostrolucky]

Can you rather embed this in https://github.com/doctrine/DoctrineBundle/blob/2.7.x/.github/workflows/coding-standards.yml?

[ostrolucky]

Hmm maybe we should have this in https://github.com/doctrine/.github/blob/main/.github/workflows/coding-standards.yml so it applies for all projects, cc @greg0ire

[greg0ire]

I think it could indeed be contributed to that repo. If we add it to the CS workflow. If we do that, the next release should probably be 2.0.0 to make it clear that an action must be taken to make the build green (fixing composer.json). It would be great to make this workflow kick in only when appropriate, using paths, otherwise it will mean one more job per project, and a job that is unlikely to fail when composer.json is not touched.

[greg0ire]

👌

review has been addressed