Add PodMutation custom resource example

Author: vbaltrusaitis-castai

examples/resources/castai_pod_mutations/resource.tf

@@ -0,0 +1,52 @@
+# castai-pod-mutator helm chart installs Kubernetes Custom Resource Definition (CRD) for the kind 'PodMutation'.
+# Pod mutation rules can then be added to a cluster as plain Kubernetes object of this kind.
+#
+# You should use a name that is _not_ shared by a mutation created via Cast AI console because.
+# In such cases, custom resource mutation will be shadowed by the mutation created via the console.
+
+resource "kubernetes_manifest" "test_pod_mutation" {
+  manifest = {
+    apiVersion = "pod-mutations.cast.ai/v1"
+    kind = "PodMutation"
+    metadata = {
+      name = "test-pod-mutation"
+    }
+    spec = {
+      filter = {
+        # Filter values can be plain strings of regexes.
+        workload = {
+          namespaces = ["production", "staging"]
+          names = ["^frontend-.*$", "^backend-.*$"]
+          kinds = ["Pod", "Deployment", "ReplicaSet"]
+        }
+        pod = {
+          # labelsOperator can be "and" or "or"
+          labelsOperator = "and"
+          labelsFilter = [
+            {
+              key   = "app.kubernetes.io/part-of"
+              value = "platform"
+            },
+            {
+              key = "tier"
+              value = "frontend"
+            }
+          ]
+        }
+      }
+      restartPolicy = "deferred"
+      patches = [
+        {
+          op = "add"
+          path = "/metadata/annotations/mutated-by-pod-mutator"
+          value = "true"
+        }
+      ]
+      spotConfig = {
+        # mode can be "optional-spot", "only-spot", or "preferred-spot"
+        mode                   = "optional-spot"
+        distributionPercentage = 50
+      }
+    }
+  }
+}