feat: allow external services to be authable (#9996)

* feat: allow external services to be authable

* Refactor external auth config structure for defaults

* Add support for new config properties

* Change the name of external auth

* Move externalauth -> external-auth

* Run gen

* Fix tests

* Fix MW tests

* Fix git auth redirect

* Fix lint

* Fix name

* Allow any ID

* Fix invalid type test

* Fix e2e tests

* Fix comments

* Fix colors

* Allow accepting any type as string

* Run gen

* Fix href

coderd/templateversions.go

@@ -280,7 +280,7 @@ func (api *API) templateVersionRichParameters(rw http.ResponseWriter, r *http.Re
 // @Tags Templates
 // @Param templateversion path string true "Template version ID" format(uuid)
 // @Success 200 {array} codersdk.TemplateVersionExternalAuth
-// @Router /templateversions/{templateversion}/externalauth [get]
+// @Router /templateversions/{templateversion}/external-auth [get]
 func (api *API) templateVersionExternalAuth(rw http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
 	var (
@@ -307,7 +307,7 @@ func (api *API) templateVersionExternalAuth(rw http.ResponseWriter, r *http.Requ
 		}
 
 		// This is the URL that will redirect the user with a state token.
-		redirectURL, err := api.AccessURL.Parse(fmt.Sprintf("/externalauth/%s", config.ID))
+		redirectURL, err := api.AccessURL.Parse(fmt.Sprintf("/external-auth/%s", config.ID))
 		if err != nil {
 			httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
 				Message: "Failed to parse access URL.",
@@ -320,6 +320,8 @@ func (api *API) templateVersionExternalAuth(rw http.ResponseWriter, r *http.Requ
 			ID:              config.ID,
 			Type:            config.Type,
 			AuthenticateURL: redirectURL.String(),
+			DisplayName:     config.DisplayName,
+			DisplayIcon:     config.DisplayIcon,
 		}
 
 		authLink, err := api.Database.GetExternalAuthLink(ctx, database.GetExternalAuthLinkParams{