Create codeql.yml

[pomek]

Suggested merge commit message (convention)

Internal: Create codeql.yml as a GitHub Workflow.

See https://github.com/cksource/ckeditor5-internal/issues/3714.

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Additional information

For example – encountered issues, assumptions you had to make, other affected tickets, etc.

[coveralls]

Pull Request Test Coverage Report for Build 495a16d1-b904-444c-a033-6552d3a68991

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build b1b72b5e-4aa2-4f30-ad5f-da4c5ff1e783:	0.0%
Covered Lines:	166
Relevant Lines:	166

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💛 - Coveralls