chore: add site flag to buildinfo (#14868)

buildinfo/buildinfo.go

@@ -24,6 +24,9 @@ var (
 	// Updated by buildinfo_slim.go on start.
 	slim bool
 
+	// Updated by buildinfo_site.go on start.
+	site bool
+
 	// Injected with ldflags at build, see scripts/build_go.sh
 	tag  string
 	agpl string // either "true" or "false", ldflags does not support bools
@@ -95,6 +98,11 @@ func IsSlim() bool {
 	return slim
 }
 
+// HasSite returns true if the frontend is embedded in the build.
+func HasSite() bool {
+	return site
+}
+
 // IsAGPL returns true if this is an AGPL build.
 func IsAGPL() bool {
 	return strings.Contains(agpl, "t")

buildinfo/buildinfo_site.go

@@ -0,0 +1,7 @@
+//go:build embed
+
+package buildinfo
+
+func init() {
+	site = true
+}