Listen on event for image build

In containers/podman#7202 a new event was
introduced. Listen on it as well.

Closes #507

src/app.jsx

@@ -328,6 +328,7 @@ class Application extends React.Component {
         case 'untag':
         case 'remove':
         case 'prune':
+        case 'build':
             this.updateImagesAfterEvent(system);
             break;
         default:

test/check-application

@@ -593,12 +593,6 @@ class TestApplication(testlib.MachineCase):
         self.execute(auth, "echo 'FROM docker.io/library/registry:2\nRUN ls' > {0}/Dockerfile".format(tmpdir))
         self.execute(auth, "podman build {0}".format(tmpdir))
 
-        # HACK due to https://github.com/containers/podman/issues/7022
-        b.reload()
-        b.enter_page("/podman")
-        b.wait_present(".listing-action")
-        b.wait_in_text("#containers-images", "registry")
-
         b.wait_not_in_text("#containers-images", "<none>:<none>")
         b.click(".listing-action button:contains('Show intermediate images')")
         b.wait_in_text("#containers-images", "<none>:<none>")