fix Filer startup failure due to JWT on / path #8149 (#8167)

* fix Filer startup failure due to JWT on / path #8149

- Comment out JWT keys in security.toml.example
- Revert Dockerfile.local change that enabled security by default
- Exempt GET/HEAD on / from JWT check for health checks

* refactor: simplify JWT bypass condition as per PR feedback

weed/server/filer_server_handlers.go

@@ -211,6 +211,10 @@ func OptionsHandler(w http.ResponseWriter, r *http.Request, isReadOnly bool) {
 // maybeCheckJwtAuthorization returns true if access should be granted, false if it should be denied
 func (fs *FilerServer) maybeCheckJwtAuthorization(r *http.Request, isWrite bool) bool {
 
+	if !isWrite && r.URL.Path == "/" {
+		return true
+	}
+
 	var signingKey security.SigningKey
 
 	if isWrite {