Add node affinity

- Node affinity will tell the kubernetes scheduler which types of nodes
  this installation "prefers" to be installed on. In this case, all we
care about is that the nodes are Linux and either arm or x86. This will
prevent the scheduler from attempting to install the controller on a
Windows node.

Signed-off-by: Brady Siegel <[email protected]>

Author: bmsiegel

charts/aws-pca-issuer/values.yaml

@@ -99,6 +99,19 @@ tolerations: []
 #            - master
 #+docs:property
 affinity:
+  nodeAffinity:
+    requiredDuringSchedulingIgnoredDuringExecution:
+      nodeSelectorTerms:
+      - matchExpressions:
+        - key: kubernetes.io/os
+          operator: In
+          values:
+          - linux
+        - key: kubernetes.io/arch
+          operator: In
+          values:
+          - amd64
+          - arm64
   podAntiAffinity:
     preferredDuringSchedulingIgnoredDuringExecution:
     - podAffinityTerm: