Add a nodeset

The base job requires this.

Change-Id: I7437b9a80ef01d34cf8ce17503f4a2caba061984
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index 418a2bf..d2bb940 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -56,7 +56,7 @@
       - zuul: opendev.org/zuul/zuul-jobs
     timeout: 1800
     post-timeout: 1800
-    nodeset: testlabel
+    nodeset: debian-testing
 
 # See the procedure described above "base" before making changes to
 # this job.
@@ -75,4 +75,4 @@
       - zuul: opendev.org/zuul/zuul-jobs
     timeout: 1800
     post-timeout: 1800
-    nodeset: testlabel
+    nodeset: debian-testing
diff --git a/zuul.d/nodesets.yaml b/zuul.d/nodesets.yaml
new file mode 100644
index 0000000..28e0ff6
--- /dev/null
+++ b/zuul.d/nodesets.yaml
@@ -0,0 +1,6 @@
+- nodeset:
+    name: debian-testing
+    nodes:
+      - name: debian-testing
+        label: testlabel
+# TODO: use a real label