runc: try to fix the number of containers

It doesn't appear to work well :(

Change-Id: I13697544fe87b5892838ff4daea75b0e5b4cca40
diff --git a/files/nodepool/nodepool.yaml b/files/nodepool/nodepool.yaml
index e0a2d6e..6ec78fd 100644
--- a/files/nodepool/nodepool.yaml
+++ b/files/nodepool/nodepool.yaml
@@ -13,28 +13,32 @@
 labels:
   - name: f29
     max-ready-age: 86400
-    min-ready: 4
+    min-ready: 1
 
 providers:
   - name: potemkin-runc
     driver: runc
     pools:
       - name: ci-f29-potemkin05-vm.vesnicky.cesnet.cz
+        max-servers: 1
         labels:
           - name: f29
             username: ci
             path: /containers/f29
       - name: ci-f29-potemkin06-vm.vesnicky.cesnet.cz
+        max-servers: 1
         labels:
           - name: f29
             username: ci
             path: /containers/f29
       - name: ci-f29-potemkin07-vm.vesnicky.cesnet.cz
+        max-servers: 1
         labels:
           - name: f29
             username: ci
             path: /containers/f29
       - name: ci-f29-potemkin08-vm.vesnicky.cesnet.cz
+        max-servers: 1
         labels:
           - name: f29
             username: ci