che: Workspace fails to start with DNS configuration issue

Describe the bug

When starting up any workspace, I get the following message:

Starting Init Plugin Broker
Cleaning /plugins dir
Unified Che Plugin Broker
List of plugins and editors to install
- che-incubator/typescript/latest - Typescript language features
- eclipse/che-machine-exec-plugin/0.0.1 - Che Plug-in with che-machine-exec service to provide creation terminal or tasks for Eclipse CHE workspace machines.
- eclipse/che-theia/7.0.0-next - Eclipse Theia, get the latest release each day.
Starting Che plugins and editor processing
Starting VS Code and Theia plugins processing
Downloading VS Code extension for plugin 'che-incubator/typescript/latest'
Get https://github.com/che-incubator/ms-code.typescript/releases/download/v1.35.1/che-typescript-language-1.35.1.vsix: x509: certificate is valid for <myDomain>, not github.com
Error: Failed to run the workspace: "Plugins installation process failed. Error: Plugin broking process for workspace workspacetmujzgxq3e83ylyx failed with error: Get https://github.com/che-incubator/ms-code.typescript/releases/download/v1.35.1/che-typescript-language-1.35.1.vsix: x509: certificate is valid for <myDomain>, not github.com"

Che version

• latest
• nightly
• other: please specify

7.0.0-rc-5.0-SNAPSHOT

Steps to reproduce

1. Deploy che using either of the following:

• chectl server:start --installer=helm --domain=<myDomain> --multiuser --platform=k8s --tls --self-signed-cert
• chectl server:start --installer=helm --domain=<myDomain> --multiuser --platform=k8s --tls or;
• chectl server:start --installer=helm --domain=<myDomain> --multiuser --platform=k8s

1. Create an organization
2. Create & startup any workspace

Expected behavior

Runtime

• kubernetes (include output of kubectl version)
• Openshift (include output of oc version)
• minikube (include output of minikube version and kubectl version)
• minishift (include output of minishift version and oc version)
• docker-desktop + K8S (include output of docker version and kubectl version)
• other: (please specify)

Screenshots

Installation method

• chectl
• che-operator
• minishift-addon
• I don’t know

chectl/0.0.2-a74ad81 linux-x64 node-v10.4.1

Environment

• my computer
  • Windows
  • Linux
  • macOS
• Cloud
  • Amazon
  • Azure
  • GCE
  • other (please specify)
• other: please specify

private cloud hosted by ubuntu server

Additional context

Looks relevant to https://github.com/eclipse/che/issues/12999 & https://github.com/eclipse/che/issues/13685 maybe?