Proxy settings using self hosted agent

[stefansta1]

We use a self hosted agent and want to upload the Coverage information to a Teamscale instance in the cloud. Due to our company policies the internet access must be done using a proxy. I haven't found a possibility to add proxy settings to the TeamscaleReportUploader task and therefor all uploads fail with the error message "xxx refused a connection. Please ensure that you have no typo and that this endpoint is reachable and not blocked by firewalls."