Add Kustomize exercise

Author: bmuschko

exercises/16-kustomize-environments/instructions.md

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+username=johndoe
+password=pwd987

exercises/16-kustomize-environments/solution/basic-auth.txt

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  namespace: q71
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:1.27.2
+        ports:
+        - name: http
+          containerPort: 80
+          protocol: TCP

exercises/16-kustomize-environments/solution/deployment.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+secretGenerator:
+- name: creds
+  namespace: q71
+  files:
+  - basic-auth.txt
+resources:
+- namespace.yaml
+- deployment.yaml
+patches:
+- path: secret-patch.yaml

exercises/16-kustomize-environments/solution/kustomization.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  name: q71

exercises/16-kustomize-environments/solution/namespace.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  namespace: q71
+spec:
+  template:
+    spec:
+      containers:
+      - name: nginx
+        envFrom:
+        - secretRef:
+            name: creds

exercises/16-kustomize-environments/solution/secret-patch.yaml

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+username=johndoe
+password=pwd987

exercises/16-kustomize-environments/solution/solution.md

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  namespace: q71
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:1.27.2
+        ports:
+        - name: http
+          containerPort: 80
+          protocol: TCP