Jira Integration certificate verify failed

When I activate the Jira Integration and make a commit with an issue-id, the i get the following error message in the integration.log

{“severity”:“ERROR”,“time”:“2019-03-25T09:56:05.721Z”,“correlation_id”:“xxxx”,“service_class”:“JiraService”,“project_id”:8,“project_path”:“myproject”,“message”:“Error sending message”,“client_url”:“https://myjira.local”,“error”:“SSL_connect returned=1 errno=0 state=error: certificate verify failed (unable to get local issuer certificate)”}

the message is clear gitlab doesn’t accept the certificate of the jira instance, how i can add the CA or the certificate to gitlab that the connection works?

For everyone havig the same problem, the solution was that a have the complete cert cain in one file Gitlab needs every cert in one single file