Add: info alert to upload archive template

logs_collector/collector/templates/collector/archive_upload.html

@@ -15,6 +15,17 @@
         <h3>Archive upload:</h3>
       </div>
       <div class="card-body">
+        <div class="container">
+          <div class="col-lg-6 alert alert-light alert-dismissible fade show" role="alert">
+            <strong>Note!</strong> 
+            <br>
+              Please do not close this page
+              until you receive an alert about a successful upload or an error.
+            <br>
+              Thank you!
+            <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
+          </div>
+        </div>
         <div id="alert" class="container"></div>
         <div class="container">
           {% crispy form %}