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 986b48a0-1af8-48de-a22e-5360aa579208

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 0df4dbc2-19e8-421f-827f-1ba6fd47a135:	0.0%
Covered Lines:	534
Relevant Lines:	534

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💛 - Coveralls