Provide dex connector for GitHub Enterprise

[TommyHwang]

Background

Currently, dex connector is available for public GitHub use.

GitHub Enterprise requires additional host settings in dex-connector-def.yaml.

Related link

https://dexidp.io/docs/connectors/github/#github-enterprise

Need to be changed

def

catalog/addons/dex/definitions/dex-connectors-def.yaml

Lines 60 to 67 in e07244f

	github?: {
	// +usage=GitHub client ID
	clientID: string
	// +usage=GitHub client secret
	clientSecret: string
	// +usage=GitHub redirect URI
	redirectURI: string
	}

ui-schema

catalog/addons/dex/schemas/component-uischema-config-dex-connector.yaml

Lines 3 to 20 in e07244f

	- jsonKey: github
	sort: 3
	uiType: Ignore
	validate:
	required: true
	conditions:
	- jsonKey: type
	op: "=="
	value: "github"
	subParameters:
	- jsonKey: clientID
	uiType: Password
	sort: 1
	- jsonKey: clientSecret
	uiType: Password
	sort: 3
	- jsonKey: redirectURI
	sort: 5

[barnettZQG]

@TommyHwang Welcome you to contribute to this and help to test.

[TommyHwang]

Update

It is currently being tested on velaux after adding hostName.
velaux returns 500 internal error as shown below.

So I'm checking api server.