Switch base nodset

Change-Id: Icf58f2a0d4a5ba5fad06ac455e4e04d719d20904
diff --git a/zuul.d/jobs.yaml b/zuul.d/jobs.yaml
index 938ea6b..1a731c3 100644
--- a/zuul.d/jobs.yaml
+++ b/zuul.d/jobs.yaml
@@ -2,6 +2,7 @@
     name: base
     parent: null
     timeout: 1800
+    nodeset: ubuntu-jammy
     pre-run: playbooks/base/pre.yaml
     post-run:
       - playbooks/base/post.yaml
@@ -10,7 +11,3 @@
       - zuul: opendev.org/zuul/zuul-jobs
       - zuul: github.com/vexxhost/zuul-jobs
       - zuul: vexxhost.dev/zuul-jobs
-    nodeset:
-      nodes:
-        - name: ubuntu-jammy
-          label: jammy-2c-8g
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