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MettleCI Workbench will need to be restarted after saving changes to config.yml.
When HTTPS is enabled, each user can add their git credentials on the Profile page which they can access from the menu in the top right corner of Workbench:
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You can then enter Git HTTPS or SSH repository URLS in the project registration page. The ssh or https credentials will be used depending on the configured Git protocol, any username shown in the URL will be ignored and overridden by the settings included in config.yml:
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