Cherry-pick to 7.7: ci: Change comment trigger detection method (#19827)#19872

Merged

kuisathaverat merged 1 commit intoelastic:7.7from kuisathaverat:backport/7.7/pr-19827

Jul 14, 2020

+22-16

Commits on Jul 14, 2020

ci: Change comment trigger detection method (elastic#19827 )

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