[installer] Allow more parts of the server config to vary

[andrew-farries]

Description

One of the Webapp team's epics for Q2 is to use the Gitpod installer to deploy to Gitpod SaaS. In order to do that we will need to add additional configuration to the installer to make the output suitable for a SaaS deployment as opposed to a self-hosted deployment.

This PR makes a few parts of the server config configurable that were previously hard-coded by the installer:

• disableDynamicAuthProviderLogin
• enableLocalApp
• defaultBaseImageRegistryWhitelist

Related Issue(s)

Part of #9097

How to test

Create an installer config file containing this experimental section:

experimental:
  webapp:
    server:
      disableDynamicAuthProviderLogin: false
      enableLocalApp: true
      defaultBaseImageRegistryWhitelist:
      - https://index.docker.io/v1/

Get a versions.yaml for use with the installer:

docker run -it --rm "eu.gcr.io/gitpod-core-dev/build/versions:${version}" cat versions.yaml > versions.yaml

Then invoke the installer as:

go run . render --debug-version-file versions.yaml --config /path/to/config --use-experimental-config

The rendered output will have the values from the config for the relevant fields in the server ConfigMap (under the config.json key).

Release Notes

Allow `disableDynamicAuthProviderLogin`, `enableLocalApp` and `defaultBaseImageRegistryWhitelist` server config to be configurable via the installer

Documentation

None.

[geropl]

Approving because the code is minimal and LGTM

/hold
bonus points for adding tests, though! 🧡

[andrew-farries]

Added tests for the configmap configuration done in this PR and previous ones.

[geropl]

/unhold

Thank you @andrew-farries ! 🙏

To fix the build issue please run leeway run components:update-license-header and push the result. 👍