Centralize deterministic JSON file writing

internal/report/report.go

@@ -1,9 +1,6 @@
 package report
 
-import (
-	"encoding/json"
-	"os"
-)
+import "gitea.maximumdirect.net/eric/seriatim/internal/jsonfile"
 
 // Severity classifies report events.
 type Severity string
@@ -62,13 +59,5 @@ func Warning(stage string, module string, message string) Event {
 
 // WriteJSON writes a deterministic JSON report.
 func WriteJSON(path string, rpt Report) error {
-	file, err := os.Create(path)
-	if err != nil {
-		return err
-	}
-	defer file.Close()
-
-	enc := json.NewEncoder(file)
-	enc.SetIndent("", "  ")
-	return enc.Encode(rpt)
+	return jsonfile.Write(path, rpt)
 }