* Check workflows for issues during CI

This PR adds an Actionlint workflow to validate GH actions as per #1866

This is an updated version of PR #1880, taking into account the discussion on that contribution.

Signed-off-by: JP Lomas <jp@theqrl.org>

* CONTRIBUTING.md update

Documents actionlint use as part of CI basic workflow including instructions of running locally.

Signed-off-by: JP Lomas <jp@theqrl.org>

* Update .github/workflows/basic.yml

Co-authored-by: Spencer Wilson <spencer.wilson@uwaterloo.ca>
Signed-off-by: JP Lomas <jp.lomas@gmail.com>

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Signed-off-by: JP Lomas <jp@theqrl.org>
Signed-off-by: JP Lomas <jp.lomas@gmail.com>
Co-authored-by: Spencer Wilson <spencer.wilson@uwaterloo.ca>