Consolidate YAML files [part-8] (#9347)

* Consolidate YAML files [part-8]

This PR exacts the YAML files referenced from the following subdirs:

- docs/concepts/workloads
- docs/concepts/configuration
- docs/concepts/policy

The following problems are fixed:

- docs/concepts/workloads/controllers/ doesnt have a 'cronjob.yaml for
  test
- the exactly same `pod.yaml` was used in both the task/config-pod-container
  topic and the concepts/configuration topics.

* Update examples_test.go

* Add missing yaml file.

content/en/examples/pods/commands.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: command-demo
+  labels:
+    purpose: demonstrate-command
+spec:
+  containers:
+  - name: command-demo-container
+    image: debian
+    command: ["printenv"]
+    args: ["HOSTNAME", "KUBERNETES_PORT"]
+  restartPolicy: OnFailure

content/en/examples/pods/pod-nginx.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: nginx
+  labels:
+    env: test
+spec:
+  containers:
+  - name: nginx
+    image: nginx
+    imagePullPolicy: IfNotPresent
+  nodeSelector:
+    disktype: ssd

content/en/examples/pods/pod-with-node-affinity.yaml

@@ -0,0 +1,26 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: with-node-affinity
+spec:
+  affinity:
+    nodeAffinity:
+      requiredDuringSchedulingIgnoredDuringExecution:
+        nodeSelectorTerms:
+        - matchExpressions:
+          - key: kubernetes.io/e2e-az-name
+            operator: In
+            values:
+            - e2e-az1
+            - e2e-az2
+      preferredDuringSchedulingIgnoredDuringExecution:
+      - weight: 1
+        preference:
+          matchExpressions:
+          - key: another-node-label-key
+            operator: In
+            values:
+            - another-node-label-value
+  containers:
+  - name: with-node-affinity
+    image: k8s.gcr.io/pause:2.0

content/en/examples/pods/pod-with-pod-affinity.yaml

@@ -0,0 +1,29 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: with-pod-affinity
+spec:
+  affinity:
+    podAffinity:
+      requiredDuringSchedulingIgnoredDuringExecution:
+      - labelSelector:
+          matchExpressions:
+          - key: security
+            operator: In
+            values:
+            - S1
+        topologyKey: failure-domain.beta.kubernetes.io/zone
+    podAntiAffinity:
+      preferredDuringSchedulingIgnoredDuringExecution:
+      - weight: 100
+        podAffinityTerm:
+          labelSelector:
+            matchExpressions:
+            - key: security
+              operator: In
+              values:
+              - S2
+          topologyKey: kubernetes.io/hostname
+  containers:
+  - name: with-pod-affinity
+    image: k8s.gcr.io/pause:2.0