Move all jobs in-repo

As part of relocating to the opendev Zuul tenant, declare our jobs
inside the repository now. This duplicates how opendev/gear is
currently configured.

Change-Id: I5d4b899665702f7a43bfe028a790dc13d0572230
Depends-On: https://review.opendev.org/773793

.zuul.yaml

@@ -46,6 +46,8 @@
     nodeset: ubuntu-focal
 
 - project:
+    vars:
+      release_python: python3
     check:
       jobs:
         - bindep-centos-7
@@ -55,6 +57,13 @@
         - bindep-ubuntu-xenial
         - bindep-ubuntu-bionic
         - bindep-ubuntu-focal
+        - build-python-release
+        - tox-pep8
+        - tox-py27
+        - tox-py35:
+            nodeset: ubuntu-xenial
+        - tox-py39:
+            nodeset: ubuntu-focal
     gate:
       jobs:
         - bindep-centos-7
@@ -64,3 +73,16 @@
         - bindep-ubuntu-xenial
         - bindep-ubuntu-bionic
         - bindep-ubuntu-focal
+        - build-python-release
+        - tox-pep8
+        - tox-py27
+        - tox-py35:
+            nodeset: ubuntu-xenial
+        - tox-py39:
+            nodeset: ubuntu-focal
+    promote:
+      jobs:
+        - opendev-promote-python
+    release:
+      jobs:
+        - opendev-release-python