add secret example

example-3-secrets/README.md

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+# Spin using Secrets in Kubernetes
+
+## Scenario
+
+This scenario will demonstrate how to inject a Kubernetes secret into a Spin Application.
+
+## Usage
+
+Create a secret
+
+```
+$ kubectl create secret generic spin-password --from-literal="password=super-secret"
+```
+
+Deploy the Spin application:
+
+```
+$ kubectl apply -f deploy_spin-secret.yaml
+```
+
+Access the Spin application:
+
+```
+$ kubectl port-forward deployment/spin-secret 8000:80
+```
+
+And access `localhost:8000` in your browser.

example-3-secrets/deploy_spin-secret.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: spin-secret
+  name: spin-secret
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: spin-secret
+  template:
+    metadata:
+      labels:
+        app: spin-secret
+    spec:
+      runtimeClassName: wasmtime-spin
+      containers:
+      - image: ghcr.io/liquid-reply/k8s-spin/spin-redis:latest
+        name: spin-env-explorer
+        command: ["/"]
+        env:
+          - name: SPIN_VARIABLE_CONFIG_VALUE
+            valueFrom:
+              secretKeyRef:
+                name: spin-password
+                key: password
+        resources:
+          limits:
+            cpu: 100m
+            memory: 100Mi
+          requests:
+            cpu: 100m
+            memory: 100Mi
+      volumes:
+        - name: spin-password
+          secret:
+            secretName: spin-password