Add test applications

Add tests application based on ocm-ramen-samples for using in drenv
tests.

We 2 variants:

- `rbd`: for testing replication using RBD mirroring
- `hostpath`: for testing replication using minikube `csi-hostpath-sc`
  via volsync.

The application are identical except the pvc storage class and namespace.

We can add another variant for CephFS once we add it to to test
environment.

Signed-off-by: Nir Soffer <nsoffer@redhat.com>

test/apps/README.md

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+# Ramen test applications
+
+This directory contains test applications for testing disaster recovery
+flows using the drenv environment.
+
+The applications are kustomized for minikube based clusters. To test on
+OpenShift clusters, use the
+[RamenDR ocm-ramen-samples repository](https://github.com/RamenDR/ocm-ramen-samples).
+
+## Channel
+
+Channel pointing to ramen github repo. Must be installed to use these
+applications.
+
+## Bases
+
+- `busybox`: Base busybox application. To create an actual application
+  create an overlay and kustomize namespace and the pvc storageClassName.
+
+- `subscription`: Base busybox subscription. To create an actual
+  subscription crate an overlay and kustomize the namespace git
+  github-path annotation.
+
+## Overlays
+
+- `rbd`: busybox and subscription overlays for testing replication with
+  RBD mirroring.
+
+- `hostpath`: busybox and subscription overlays for testing replication
+  using `csi-hostpath-sc` storage class via `volsync`.
+
+## Deployment
+
+1. Install the channel
+
+   ```
+   kubectl apply -k channel
+   ```
+
+2. Install the subscription
+
+   To install the `rbd` subscription and application:
+
+   ```
+   kubectl apply -k rbd/subscription
+   ```
+
+   This installs the busybox-sub subscription in in the `busybox-rbd`
+   namespace on the 'hub' cluster, and the `busybox` application in the
+   `busybox-rbd` namespace in cluster `dr1`.

test/apps/busybox/deploy.yaml

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+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    appname: busybox
+  name: busybox
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      appname: busybox
+  template:
+    metadata:
+      labels:
+        appname: busybox
+    spec:
+      containers:
+      - image: docker.io/library/busybox:stable
+        imagePullPolicy: IfNotPresent
+        name: busybox
+        command: ['sh', '-c', 'trap exit TERM; while true; do echo $(date) | tee -a /mnt/test/outfile; sync; sleep 10 & wait; done']
+        volumeMounts:
+          - name: mypvc
+            mountPath: /mnt/test
+      volumes:
+        - name: mypvc
+          persistentVolumeClaim:
+            claimName: busybox-pvc
+      securityContext:
+        runAsUser: 10000
+        runAsGroup: 10000
+        fsGroup: 10000

test/apps/busybox/kustomization.yaml

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+---
+resources:
+- pvc.yaml
+- deploy.yaml

test/apps/busybox/pvc.yaml

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+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: busybox-pvc
+  labels:
+    appname: busybox
+spec:
+  accessModes:
+  - ReadWriteOnce
+  storageClassName: storage-class-name
+  resources:
+    requests:
+      storage: 5Gi

test/apps/channel/channel.yaml

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+---
+apiVersion: apps.open-cluster-management.io/v1
+kind: Channel
+metadata:
+  name: ramen-gitops
+  namespace: ramen-samples
+spec:
+  type: GitHub
+  pathname: https://github.com/RamenDR/ramen.git

test/apps/channel/kustomization.yaml

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+resources:
+- channel.yaml
+- namespace.yaml

test/apps/channel/namespace.yaml

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+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: ramen-samples

test/apps/hostpath/busybox/kustomization.yaml

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+---
+resources:
+- ../../busybox
+namespace: busybox-hostpath
+patches:
+- target:
+    kind: PersistentVolumeClaim
+    name: busybox-pvc
+  patch: |-
+    - op: replace
+      path: /spec/storageClassName
+      value: csi-hostpath-sc

test/apps/hostpath/subscription/kustomization.yaml

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+---
+resources:
+- ../../subscription
+namespace: busybox-hostpath
+patches:
+- target:
+    kind: Subscription
+    name: busybox-sub
+  patch: |-
+    - op: replace
+      path: /metadata/annotations/apps.open-cluster-management.io~1github-path
+      value: test/apps/hostpath/busybox

test/apps/rbd/busybox/kustomization.yaml

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+---
+resources:
+- ../../busybox
+namespace: busybox-rbd
+patches:
+- target:
+    kind: PersistentVolumeClaim
+    name: busybox-pvc
+  patch: |-
+    - op: replace
+      path: /spec/storageClassName
+      value: rook-ceph-block

test/apps/rbd/subscription/kustomization.yaml

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+---
+resources:
+- ../../subscription
+namespace: busybox-rbd
+patches:
+- target:
+    kind: Subscription
+    name: busybox-sub
+  patch: |-
+    - op: replace
+      path: /metadata/annotations/apps.open-cluster-management.io~1github-path
+      value: test/apps/rbd/busybox

test/apps/subscription/drpc.yaml

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+---
+apiVersion: ramendr.openshift.io/v1alpha1
+kind: DRPlacementControl
+metadata:
+  name: busybox-drpc
+  labels:
+    app: busybox-sample
+spec:
+  preferredCluster: dr1
+  drPolicyRef:
+    name: dr-policy
+  placementRef:
+    kind: PlacementRule
+    name: busybox-placement
+  pvcSelector:
+    matchLabels:
+      appname: busybox

test/apps/subscription/kustomization.yaml

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+resources:
+- namespace.yaml
+- placementrule.yaml
+- subscription.yaml
+- drpc.yaml

test/apps/subscription/namespace.yaml

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+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: busybox-sample

test/apps/subscription/placementrule.yaml

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+---
+apiVersion: apps.open-cluster-management.io/v1
+kind: PlacementRule
+metadata:
+  name: busybox-placement
+  labels:
+    app: busybox-sample
+spec:
+  clusterConditions:
+    - type: ManagedClusterConditionAvailable
+      status: True
+  clusterReplicas: 1
+  schedulerName: ramen

test/apps/subscription/subscription.yaml

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+---
+apiVersion: apps.open-cluster-management.io/v1
+kind: Subscription
+metadata:
+  annotations:
+    apps.open-cluster-management.io/github-branch: main
+    apps.open-cluster-management.io/github-path: github-path
+  labels:
+    app: busybox-sample
+  name: busybox-sub
+spec:
+    channel: ramen-samples/ramen-gitops
+    placement:
+      placementRef:
+        kind: PlacementRule
+        name: busybox-placement