[self-hosted] Support `https_proxy`

[corneliusludmann]

Running Gitpod with an HTTPS proxy is not officially supported yet.

• Make sure that all pods are considering the https_proxy environment variable #12835
• Allow to add the environment variable #12820
  • Add config option to the Installer
  • Add KOTS configuration or better pick up configuration from the KOTS CLI option
• Add documentation
• Add automated tests with HTTPS proxy #12821
• Workspace team changes to support HTTP_PROXY #12825
• WebApp team changes to support HTTP_PROXY #12826
• IDE team changes to support HTTP_PROXY #12827

(internal discussion)

• Internal ticket

[mrsimonemms]

Having looked into this a little, from the Installer point of view this looks fairly straightforward (a skeleton PR will be up shortly). As kots install has support for --http-proxy, --https-proxy and --no-proxy (which last week's customer issue with Amulya demonstrated that these are likely all needed), I think we should support all issues.

My preference is to get the KOTS installer to add a configmap which is then used to set the envvar values and these are then added to the DefaultEnv function in the common package, which will add to every component.

It's then up to the owners of each individual component to decide on how best to implement these envvars.

[mrsimonemms]

Have put it into a blocked state as this needs some pairing from other teams. See internal discussion

[lucasvaltl]

Requires collaboration from team workspace - hence adding this to their inbox as well for prioritisation. Team workspace - we're here to help with any questions 👋