ci: Raise pod resource requirements

Push the resource requests higher to try to convince Kubernetes to run
the builds on cloud nodes instead of Raspberry Pis.

ci/podTemplate.yaml

@@ -6,8 +6,10 @@ spec:
     stdin: true
     tty: true
     resources:
-      requests:
+      requests: &resources
-        cpu: 1500m
+        cpu: 6
+        memory: 4Gi
+      limits: *resources
     volumeMounts:
     - mountPath: /etc/ssh/ssh_known_hosts
       name: ssh-known-hosts