Add a minimal child job

.zuul.yaml

@@ -1,4 +1,22 @@
+- job:
+    name: dnf-run-tests
+    description: Run DNF tests
+    roles:
+      - zuul: zuul-distro-jobs
+    requires: repo
+#    require-projects:
+#      - rpm-software-management/ci-dnf-stack
+    branches:
+      - master
+    vars:
+      dnf_master_copr: fbo/dnf-master
+    run: zuul-ci/run-tests.yaml
+    nodeset: fedora-31-vm
+
 - project:
     check:
       jobs:
         - dnf-rpm-build
+        - dnf-run-tests:
+            dependencies:
+              - dnf-rpm-build

zuul-ci/run-tests.yaml

@@ -0,0 +1,9 @@
+- hosts: all
+  roles:
+    - repo-setup
+  tasks:
+    - name: Show zuul-build repo definition
+      command: cat /etc/yum.repos.d/zuul-build.repo 
+    - name: Install fbo/dnf-master copr
+      become: True
+      command: dnf -y copr enable {{ dnf_master_copr }}