Set resource limit for Loki pods

So far, there were no limits to the resources the Loki pod was allowed
to use. This now sets limits that in my observation for now seem to
work. With handling more and more logs, these limits will probably have
to be increased.

Change-Id: I7313488a60da8a1fff28666870549f748400735a
diff --git a/charts/loki/loki.yaml b/charts/loki/loki.yaml
index 51f26f0..e186fa7 100644
--- a/charts/loki/loki.yaml
+++ b/charts/loki/loki.yaml
@@ -153,13 +153,13 @@
 
 replicas: 1
 
-resources: {}
-# limits:
-#   cpu: 200m
-#   memory: 256Mi
-# requests:
-#   cpu: 100m
-#   memory: 128Mi
+resources:
+  limits:
+    cpu: 2
+    memory: 3Gi
+  requests:
+    cpu: 1
+    memory: 2Gi
 
 securityContext:
   fsGroup: 10001