COPR / tag tests: handle GNOME "download unsigned" prompt

When using a side repo for testing a COPR or a side tag, there
may be unsigned packages. We set gpgcheck=0 to make dnf okay
with this, but gnome-software still shows a warning. Let's
click through it so the test can complete.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

needles/gnome/desktop_package_tool_update_download_unsigned-20240611.json

@@ -0,0 +1,22 @@
+{
+  "area": [
+    {
+      "xpos": 469,
+      "ypos": 247,
+      "width": 89,
+      "height": 22,
+      "type": "match"
+    },
+    {
+      "xpos": 580,
+      "ypos": 550,
+      "width": 71,
+      "height": 19,
+      "type": "match"
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "desktop_package_tool_update_download_unsigned"
+  ]
+}

tests/desktop_update_graphical.pm

@@ -117,6 +117,11 @@ sub run {
             # for apply (only)
             wait_screen_change { click_lastmatch; };
             $n -= 1 if ($n > 1);
+            if (get_var("TAG") || get_var("COPR")) {
+                # we might get a 'download unsigned software' prompt
+                # https://gitlab.gnome.org/GNOME/gnome-software/-/issues/2246
+                click_lastmatch if (check_screen "desktop_package_tool_update_download_unsigned", 30);
+            }
             $tags = ['desktop_package_tool_update_apply'];
             next;
         }
@@ -133,6 +138,11 @@ sub run {
         # handle reboot confirm screen which pops up when user is
         # logged in (but don't fail if it doesn't as we're not testing
         # that)
+        if (get_var("TAG") || get_var("COPR")) {
+            # we might get a 'download unsigned software' prompt
+            # https://gitlab.gnome.org/GNOME/gnome-software/-/issues/2246
+            click_lastmatch if (check_screen "desktop_package_tool_update_download_unsigned", 5);
+        }
         if (check_screen 'gnome_reboot_confirm', 15) {
             send_key 'tab';
             send_key 'ret';