chore: add workspace proxies to the backend (#7032)

Co-authored-by: Dean Sheather <dean@deansheather.com>

coderd/deployment.go

@@ -2,6 +2,7 @@ package coderd
 
 import (
 	"net/http"
+	"net/url"
 
 	"github.com/coder/coder/buildinfo"
 	"github.com/coder/coder/coderd/httpapi"
@@ -67,11 +68,15 @@ func (api *API) deploymentStats(rw http.ResponseWriter, r *http.Request) {
 // @Tags General
 // @Success 200 {object} codersdk.BuildInfoResponse
 // @Router /buildinfo [get]
-func buildInfo(rw http.ResponseWriter, r *http.Request) {
-	httpapi.Write(r.Context(), rw, http.StatusOK, codersdk.BuildInfoResponse{
-		ExternalURL: buildinfo.ExternalURL(),
-		Version:     buildinfo.Version(),
-	})
+func buildInfo(accessURL *url.URL) http.HandlerFunc {
+	return func(rw http.ResponseWriter, r *http.Request) {
+		httpapi.Write(r.Context(), rw, http.StatusOK, codersdk.BuildInfoResponse{
+			ExternalURL:    buildinfo.ExternalURL(),
+			Version:        buildinfo.Version(),
+			DashboardURL:   accessURL.String(),
+			WorkspaceProxy: false,
+		})
+	}
 }
 
 // @Summary SSH Config