[dev] build job: move from name-based to label-based node selector

Author: geropl

.werft/build.yaml

@@ -1,8 +1,15 @@
 # debug using `werft run github -f -s .werft/build.js -j .werft/build.yaml -a debug=true`
 pod:
   serviceAccount: werft
-  nodeSelector:
-    cloud.google.com/gke-nodepool: builds
+  affinity:
+    nodeAffinity:
+      requiredDuringSchedulingIgnoredDuringExecution:
+        nodeSelectorTerms:
+        - matchExpressions:
+          - key: dev/workload
+            operator: In
+            values:
+            - "builds"
   volumes:
   - name: monitoring-satellite-preview-token
     secret:

.werft/changelog.yaml

@@ -2,8 +2,15 @@
 # this werft job is periodically run every night
 pod:
   serviceAccount: werft
-  nodeSelector:
-    cloud.google.com/gke-nodepool: builds
+  affinity:
+    nodeAffinity:
+      requiredDuringSchedulingIgnoredDuringExecution:
+        nodeSelectorTerms:
+        - matchExpressions:
+          - key: dev/workload
+            operator: In
+            values:
+            - "builds"
   containers:
   - name: build
     image: eu.gcr.io/gitpod-core-dev/dev/changelog:0.0.24