chore: centralize build info for site (#13104)

The build info passed to the frontend via HTML was incorrect.

site/site.go

@@ -34,7 +34,6 @@ import (
 	"golang.org/x/sync/singleflight"
 	"golang.org/x/xerrors"
 
-	"github.com/coder/coder/v2/buildinfo"
 	"github.com/coder/coder/v2/coderd/appearance"
 	"github.com/coder/coder/v2/coderd/database"
 	"github.com/coder/coder/v2/coderd/database/db2sdk"
@@ -78,6 +77,7 @@ type Options struct {
 	SiteFS            fs.FS
 	OAuth2Configs     *httpmw.OAuth2Configs
 	DocsURL           string
+	BuildInfo         codersdk.BuildInfoResponse
 	AppearanceFetcher *atomic.Pointer[appearance.Fetcher]
 }
 
@@ -149,12 +149,7 @@ func New(opts *Options) *Handler {
 			// static files.
 			OnlyFiles(opts.SiteFS))),
 	)
-
-	buildInfo := codersdk.BuildInfoResponse{
-		ExternalURL: buildinfo.ExternalURL(),
-		Version:     buildinfo.Version(),
-	}
-	buildInfoResponse, err := json.Marshal(buildInfo)
+	buildInfoResponse, err := json.Marshal(opts.BuildInfo)
 	if err != nil {
 		panic("failed to marshal build info: " + err.Error())
 	}