Transition to Tox (#1617)

diff --git a/zuul.d/project.yaml b/zuul.d/project.yaml
index cd2e55c..5ee333d 100644
--- a/zuul.d/project.yaml
+++ b/zuul.d/project.yaml
@@ -17,6 +17,7 @@
     check:
       jobs:
         - atmosphere-linters
+        - atmosphere-tox-py3
         - atmosphere-build-collection:
             dependencies: &molecule_check_dependencies
               - name: atmosphere-build-container-image-barbican
@@ -84,6 +85,7 @@
     gate:
       jobs:
         - atmosphere-linters
+        - atmosphere-tox-py3
         - atmosphere-build-collection:
             dependencies: &molecule_gate_dependencies
               - name: atmosphere-upload-container-image-barbican