Run code analysis automatically via GitHub Action

[khalwat]

Added a GitHub Action that will automatically run phpstan and ecs code quality tools on pushes to the develop branch.

This likely could easily be extended to run unit tests on pushes as well (see the notes in the .github/workflows/code-analysis.yaml file)

It should be a simple copy pasta to add this to your other plugins, but that's left as an exercise for the reader

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[khalwat]

One thing I should have mentioned in this initial PR is that these inspections do not, and can not, alter the code in any way.

The repo is checked out in a container running in the cloud, the inspections are done there, and then the containers are discarded. Nothing is ever checked back in to the repository.

They are merely pass/fail tests that will be run on any PR or push, as an indicator to you that something is amiss.

[bencroker]

Thanks!