Wait until pod is ready

Locally the pod is always ready when the deployment is rolled out, but
on github we fail consistently with:

      drenv.commands.Error: Command failed:
         command: ('kubectl', 'exec', '--context', 'test-319c31e02513d53a5b0c2ebb71351f94-cluster',
                   'deploy/example-deployment', '--', 'hostname')
         exitcode: 1
         error:
            error: unable to upgrade connection: container not found ("example")

Signed-off-by: Nir Soffer <nsoffer@redhat.com>

test/addons/example/start

@@ -25,3 +25,12 @@ kubectl.rollout(
     "--timeout=180s",
     context=cluster,
 )
+
+print("waiting until pod is ready")
+kubectl.wait(
+    "pod",
+    "--selector=app=example",
+    "--for=condition=Ready",
+    "--timeout=180s",
+    context=cluster,
+)