Release the repository from CI

[pomek]

Suggested merge commit message (convention)

Internal: Redesign the release process to allow it to be processed from CircleCI.

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Additional information

• Part of https://github.com/cksource/ckeditor5-internal/issues/3710.
• Requires: https://github.com/ckeditor/ckeditor5-dev/pull/969.

[coveralls]

Pull Request Test Coverage Report for Build 0b676f2c-e826-478d-b2f9-578d41f6100c

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 d0c05295-4c6e-4053-b490-b830bcf1f4ab:	0.0%
Covered Lines:	539
Relevant Lines:	539

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💛 - Coveralls