enable manual coverity scan builds in gitlab-ci
I'm not sure what to specify in COVERITY_SCAN_NOTIFICATION_EMAIL, feel free to modify it appropriately
also, COVERITY_SCAN_TOKEN must be specified in gitlab-ci variables
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I'm not sure what to specify in COVERITY_SCAN_NOTIFICATION_EMAIL, feel free to modify it appropriately
also, COVERITY_SCAN_TOKEN must be specified in gitlab-ci variables