improve download releases button

app/assets/javascripts/download_releases.js

@@ -0,0 +1,20 @@
+$(document).on("click", "#download_releases", function(event) {
+    event.preventDefault();
+
+    const releasable_ids = JSON.parse($("#selected_releases_form").attr('data-releasable-ids'));
+    const total_entries = $('#total_entries').val();
+
+    const input_ids = $('<input>').attr({ type: 'hidden', name: 'release_ids', value: JSON.stringify(releasable_ids) });
+    const search_query = $('<input>').attr({ type: 'hidden', name: 'search_query', value: $("form input[type='search']").val() });
+    const type_filter = $('<input>').attr({ type: 'hidden', name: 'type_filter', value: $('#type_filter_value').val() });
+
+    const download_count = releasable_ids.length > 0 ? releasable_ids.length : total_entries;
+
+    $(this).parent().append(input_ids);
+    $(this).parent().append(search_query);
+    $(this).parent().append(type_filter);
+
+    if (confirm(`${download_count} release(s) will be downloaded. Is this correct?`)){
+        Rails.fire($(this).parent()[0], 'submit');
+    }
+});