Fold Arduino Lint report in logs

The Arduino Lint report is shown in the logs whenever a warning or error is encountered while validating a release before
adding it to the index. The report is fairly verbose. Putting it in a "details" section allow the reader to get the quick
overview of the indexing results that was provided by the previous log format, while also offering the option to get
details about the results of the validation.

Author: per1234

Diff for: sync_libraries.go

@@ -298,12 +298,18 @@ func syncLibraryTaggedRelease(logger *log.Logger, repo *libraries.Repository, ta
 	}
 
 	report, err := libraries.RunArduinoLint(repo.FolderPath, repoMeta)
+	reportTemplate := `<a href="https://arduino.github.io/arduino-lint/latest/">Arduino Lint</a> %s:
+<details><summary>Click to expand Arduino Lint report</summary>
+<hr>
+%s
+<hr>
+</details>`
 	if err != nil {
-		logger.Printf("<a href=\"https://arduino.github.io/arduino-lint/latest/\">Arduino Lint</a> found errors:\n%s", report)
+		logger.Printf(reportTemplate, "found errors", report)
 		return err
 	}
 	if report != nil {
-		logger.Printf("<a href=\"https://arduino.github.io/arduino-lint/latest/\">Arduino Lint</a> has suggestions for possible improvements:\n%s", report)
+		logger.Printf(reportTemplate, "has suggestions for possible improvements", report)
 	}
 
 	zipName := libraries.ZipFolderName(library)