mysql: Add k8s first example

mysql/k8s/02_mysql_statefulset.yaml

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+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: mysql-db-deployment
+  labels:
+    app: mysql-db
+spec:
+  serviceName: mysql-db-service
+  replicas: 1
+  selector:
+    matchLabels:
+      app: mysql-db
+  template:
+    metadata:
+      labels:
+        app: mysql-db
+    spec:
+      containers:
+      - name: mysql
+        image: mysql:9
+        resources:
+          requests:
+            memory: "512Mi"
+            cpu: "1000m"
+          limits:
+            memory: "2048Mi"
+            cpu: "2000m"
+        ports:
+        - containerPort: 3306
+        env:
+        - name: MYSQL_ROOT_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: mysql-secret
+              key: mysql-root-password
+        volumeMounts:
+        - name: mysql-data
+          mountPath: /var/lib/mysql
+  volumeClaimTemplates:
+  - metadata:
+      name: mysql-data
+    spec:
+      accessModes: [ "ReadWriteOnce" ]
+      resources:
+        requests:
+          storage: 1Gi