新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch08/todo-list/db/backup/todo-db-backup-cronjob.yaml

@@ -0,0 +1,34 @@
+apiVersion: batch/v1beta1
+kind: CronJob
+metadata:
+  name: todo-db-backup
+  labels:
+    kiamol: ch08
+spec:
+  schedule: "*/2 * * * *"        # see https://crontab.guru
+  concurrencyPolicy: Forbid
+  jobTemplate:
+    spec:
+      template:
+        spec:
+          restartPolicy: Never
+          containers:
+          - name: backup
+            image: postgres:11.6-alpine
+            command: ['sh', '-c', 'pg_dump -h $POSTGRES_SECONDARY_FQDN -U postgres -F tar -f "/backup/$(date +%y%m%d-%H%M).tar" todo']
+            envFrom:
+            - configMapRef:
+                name: todo-db-env
+            env:
+            - name: PGPASSWORD
+              valueFrom:
+                secretKeyRef:
+                  key: POSTGRES_PASSWORD
+                  name: todo-db-secret
+            volumeMounts:
+              - name: backup
+                mountPath: "/backup"
+          volumes:
+            - name: backup
+              persistentVolumeClaim:
+                claimName: todo-db-backup-pvc

learn/learn-kubernetes-master/kiamol/ch08/todo-list/db/backup/todo-db-backup-pvc.yaml

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+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: todo-db-backup-pvc
+  labels:
+    kiamol: ch08
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 100Mi

learn/learn-kubernetes-master/kiamol/ch08/todo-list/db/backup/update/todo-db-backup-cronjob-suspend.yaml

@@ -0,0 +1,35 @@
+apiVersion: batch/v1beta1
+kind: CronJob
+metadata:
+  name: todo-db-backup
+  labels:
+    kiamol: ch08
+spec:
+  schedule: "*/2 * * * *"        # see https://crontab.guru
+  concurrencyPolicy: Forbid
+  suspend: true
+  jobTemplate:
+    spec:
+      template:
+        spec:
+          restartPolicy: Never
+          containers:
+          - name: backup
+            image: postgres:11.6-alpine
+            command: ['sh', '-c', 'pg_dump -h $POSTGRES_SECONDARY_FQDN -U postgres -F tar -f "/backup/$(date +%y%m%d-%H%M).tar" todo']
+            envFrom:
+            - configMapRef:
+                name: todo-db-env
+            env:
+            - name: PGPASSWORD
+              valueFrom:
+                secretKeyRef:
+                  key: POSTGRES_PASSWORD
+                  name: todo-db-secret
+            volumeMounts:
+              - name: backup
+                mountPath: "/backup"
+          volumes:
+            - name: backup
+              persistentVolumeClaim:
+                claimName: todo-db-backup-pvc