Switch base nodset

Change-Id: Icf58f2a0d4a5ba5fad06ac455e4e04d719d20904
diff --git a/zuul.d/nodesets.yaml b/zuul.d/nodesets.yaml
new file mode 100644
index 0000000..1da2f05
--- /dev/null
+++ b/zuul.d/nodesets.yaml
@@ -0,0 +1,5 @@
+- nodeset:
+    name: ubuntu-jammy
+    nodes:
+      - name: ubuntu-jammy
+        label: jammy-8c-8g