docs: add kubernetes and workflow documentation

k8s/overlays/prod/deployment-image-digest-patch.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: vendaweb-api
+spec:
+  template:
+    spec:
+      containers:
+        - name: api
+          image: harbor.jurunense.com/library/vendaweb-api@sha256:aac490fcb4ef7baa95f1df01fa50d2d44bdb4ed12b235e5dd89e1d7dc3cd0a3a

k8s/overlays/prod/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: vendaweb-prod
+
+resources:
+  - ../../base
+
+patches:
+  - path: deployment-image-digest-patch.yaml
+  - path: service-patch.yaml

k8s/overlays/prod/service-patch.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: vendaweb-api
+spec:
+  type: NodePort
+  ports:
+    - name: http
+      port: 8065
+      targetPort: 8065
+      nodePort: 30001