fix /tmp/ prefix in lambda email attachment (#60)

src/email-helpers.js

@@ -108,7 +108,7 @@ const getmailOptions = (url, sender, recipient, file, emailSubject, note, emailb
         cid: 'opensearch_logo_darkmode'
       },
       {
-        filename: file,
+        filename: path.basename(file),
         path: file
       }],
     template: 'index',
@@ -126,4 +126,4 @@ function deleteTemporaryImage(emailbody) {
   if (fs.existsSync(emailbody)) {
     fs.unlinkSync(emailbody);
   }
-}
+}