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.

Differences compared to ocm-ramen-samples:

- Different directory layout - every app has a subscription and
  application directory. Both use kustomization based on a base
  application or subscription.
- The channel is separated from the applications, since we have need
  only one channel pointing to the ramen repo.
- The deployment uses security context so the app runs as unprivileged
  user.
- The apps are part of ramen repo, so it is easier to maintain, an we
  don't need to worry about affecting users or QE when changing the
  applications.
- Fix yamllint errors
- Add SPDX headers

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.  See `*/busybox/kustomization.yaml` for example.
+
+- `subscription`: Base busybox subscription. To create an actual
+  subscription create an overlay and kustomize the namespace and
+  github-path annotation. See `*/subscription/kustomization.yaml` for
+  example.
+
+## 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
+   ```
+
+   This install a `ramen-gitops` channel in the `ramen-test` namespace,
+   pointing the ramen repo on github.
+
+1. Install the subscriptions
+
+   ```
+   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`.
+
+   To install the `hostpath` subscription replace `rbd` with `hostpath`.
+   The subscription and applications are installed in the
+   `busybox-hostpath` namespace.

test/apps/busybox/deploy.yaml

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+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+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
+              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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+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+resources:
+- pvc.yaml
+- deploy.yaml

test/apps/busybox/pvc.yaml

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+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: busybox-pvc
+  labels:
+    appname: busybox
+spec:
+  accessModes:
+  - ReadWriteOnce
+  storageClassName: storage-class-name
+  resources:
+    requests:
+      storage: 1Gi

test/apps/channel/channel.yaml

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+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+apiVersion: apps.open-cluster-management.io/v1
+kind: Channel
+metadata:
+  name: ramen-gitops
+  namespace: ramen-test
+spec:
+  type: GitHub
+  pathname: https://github.com/RamenDR/ramen.git

test/apps/channel/kustomization.yaml

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+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+resources:
+- channel.yaml
+- namespace.yaml

test/apps/channel/namespace.yaml

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+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: ramen-test

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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+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+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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+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+resources:
+- namespace.yaml
+- placementrule.yaml
+- subscription.yaml
+- drpc.yaml

test/apps/subscription/namespace.yaml

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+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: busybox-sample

test/apps/subscription/placementrule.yaml

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+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+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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+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
+---
+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-test/ramen-gitops
+  placement:
+    placementRef:
+      kind: PlacementRule
+      name: busybox-placement