Fix how to run the test locally

Javier Tiarequested to merge
run-test-locally into main

From a development standpoint, sometimes it's neccessary to test and debug changes locally before submitting a merge/pull request.

Document the dependencies to jinja2/squad-client Python apps and SQUAD_HOST and SQUAD_TOKEN environment variables.

Fix the dependency to CI_COMMIT_SHORT_SHA. Fill it either from environment or Git.

Rest of changes are cosmetic and done automatically by EditorConfig.

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