Add GH action that runs the automated-tests every night

[fabianrbz]

Description

Add GH action that runs the automated-tests every night + workflow_dispatch

Preview Links

Checklist

• Every page is page one.
• Tested how-to docs. If not, note why here.
• All pages contain metadata.
• Updated sources.yaml. For more info, review track docs changes
• Any new docs link to existing docs.
• All autogenerated instructions render correctly (API, decK, Konnect, Kong Manager).
• Style guide (capitalized gateway entities, placeholder URLs) implemented correctly.

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