T7579: added workflow for CLA (#427)

• T7579: added workflow for CLA

• T7579: fix of the run trigger for CLA

• added a new line

• added the changelog fragment

• fix a new line character at the end of file

• fixed new line issues (#427) - https://github.com/vyos/vyos.vyos/pull/427

• removed blank lines (#427)

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Co-authored-by: Yevhen Bondarenko <evgeniy.bondarenko@sentrium.io>