Add docs for testing argo rollouts, add example manifests for argo ro…

…llouts

docs/testing-argo-rollouts.md

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+# Testing Argo Rollouts
+
+Follow [argo rollouts installation](https://argo-rollouts.readthedocs.io/en/stable/installation/) instructions to install the controller and kubectl plugin
+
+## Actually Testing
+
+Deploy `install-prod.yaml` from [releases](https://github.com/Contrast-Security-OSS/agent-operator/releases).
+
+```bash
+# Install the production manifests.
+kubectl apply -f install-prod.yaml
+
+# Wait for the cluster to converge.
+watch kubectl -n contrast-agent-operator get pods
+
+# Check the logs for any problems.
+kubectl -n contrast-agent-operator logs deployment/contrast-agent-operator -f
+```
+
+Then we can deploy argo rollout examples
+
+```bash
+# Install the Argo Rollout only examples (e.g. Rollout).
+kubectl apply -k ./manifests/examples/argo-rollouts
+
+# Promote the rollout to finish the agent injection
+kubectl argo rollouts promote dotnet-core-app
+
+# Inspect rollout in another terminal
+kubectl argo rollouts get rollout dotnet-core-app --watch
+```
+
+We can also force a change on the container to trigger a rollout
+
+```bash
+# Optional: Force a change to the container to trigger a rollout
+kubectl argo rollouts set image dotnet-core-app dotnet-core-app=contrast/sample-app-aspnetcore:main
+
+# Promote the rollout to finish
+kubectl argo rollouts promote dotnet-core-app
+```

manifests/examples/argo-rollouts/base/dotnet-core.yaml

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+apiVersion: argoproj.io/v1alpha1
+kind: Rollout
+metadata:
+  name: dotnet-core-app
+  namespace: default
+  labels:
+    app: dotnet-core-app
+spec:
+  replicas: 2
+  strategy:
+    canary:
+      steps:
+      - setWeight: 20
+      - pause: {}
+      - setWeight: 40
+      - pause: {duration: 10}
+  revisionHistoryLimit: 1
+  selector:
+    matchLabels:
+      app: dotnet-core-app
+  template:
+    metadata:
+      labels:
+        app: dotnet-core-app
+      annotations:
+        test: test
+    spec:
+      containers:
+        - image: contrast/sample-app-aspnetcore:latest
+          name: dotnet-core-app
+          ports:
+            - containerPort: 80
+              name: http

manifests/examples/argo-rollouts/base/minimal-setup.yaml

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+apiVersion: agents.contrastsecurity.com/v1beta1
+kind: AgentInjector
+metadata:
+  name: example-injector-dotnet-core
+spec:
+  enabled: true
+  version: latest
+  type: dotnet-core
+  selector:
+    images:
+      - "*"
+    labels:
+      - name: app
+        value: dotnet-core-app
+  connection:
+    name: example-agent-connection
+  configuration:
+    name: example-agent-configuration
+---
+apiVersion: agents.contrastsecurity.com/v1beta1
+kind: AgentConnection
+metadata:
+  name: example-agent-connection
+spec:
+  url: http://localhost
+  apiKey:
+    secretName: example-agent-connection-secret
+    secretKey: apiKey
+  serviceKey:
+    secretName: example-agent-connection-secret
+    secretKey: serviceKey
+  userName:
+    secretName: example-agent-connection-secret
+    secretKey: userName
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: example-agent-connection-secret
+type: Opaque
+stringData:
+  apiKey: apiKey
+  serviceKey: serviceKey
+  userName: userName
+---
+apiVersion: agents.contrastsecurity.com/v1beta1
+kind: AgentConfiguration
+metadata:
+  name: example-agent-configuration
+spec:
+  yaml: |
+    enabled: true

manifests/examples/argo-rollouts/kustomization.yaml

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+namespace: default
+resources:
+  - base/dotnet-core.yaml
+  - base/minimal-setup.yaml