Add examples for using oc

This will add examples of using oc binary in task
It will add a dockerfile of oc binary and two
examples

1. Using oc on same cluster using serviceAccount
2. Using oc on different cluster using clusterResource

Thanks

openshift-cli/Dockerfile

@@ -0,0 +1,13 @@
+FROM docker.io/centos:7
+
+RUN cd /tmp \
+  && yum -y update \
+  && yum install -y wget \
+  && wget https://mirror.openshift.com/pub/openshift-v3/clients/4.0.22/linux/oc.tar.gz \
+  && tar -xvzf oc.tar.gz \
+  && mv oc /usr/local/bin/ \
+  && rm -rf oc.tar.gz
+
+ENTRYPOINT ["oc"]
+
+CMD ["help"]

openshift-cli/taskUsingClusterResource/octaskresource.yaml

@@ -0,0 +1,30 @@
+apiVersion: tekton.dev/v1alpha1
+kind: Task
+metadata:
+  name: task-openshift-command-clusterresource
+spec:
+  inputs:
+    resources:
+      - name: clusterdetails
+        type: cluster
+  steps:
+    - name: version
+      image: quay.io/openshift-pipeline/openshift-cli
+      command:
+        - /usr/local/bin/oc
+      args: ["--kubeconfig", "/workspace/${inputs.resources.clusterdetails.name}/kubeconfig", "--context", "${inputs.resources.clusterdetails.name}", "version"]
+    - name: pods
+      image: quay.io/openshift-pipeline/openshift-cli
+      command:
+       - /usr/local/bin/oc
+      args: ["--kubeconfig", "/workspace/${inputs.resources.clusterdetails.name}/kubeconfig", "--context", "${inputs.resources.clusterdetails.name}", "get", "pods"]
+    - name: user
+      image: quay.io/openshift-pipeline/openshift-cli
+      command:
+        - /usr/local/bin/oc
+      args: ["--kubeconfig", "/workspace/${inputs.resources.clusterdetails.name}/kubeconfig", "--context", "${inputs.resources.clusterdetails.name}", "whoami"]
+    - name: status
+      image: quay.io/openshift-pipeline/openshift-cli
+      command:
+        - /usr/local/bin/oc
+      args: ["--kubeconfig", "/workspace/${inputs.resources.clusterdetails.name}/kubeconfig", "--context", "${inputs.resources.clusterdetails.name}", "status"]

openshift-cli/taskUsingClusterResource/octaskrunresource.yaml

@@ -0,0 +1,12 @@
+apiVersion: tekton.dev/v1alpha1
+kind: TaskRun
+metadata:
+  name: task-run-openshift-command-clusterresource
+spec:
+  taskRef:
+    name: task-openshift-command-clusterresource
+  inputs:
+    resources:
+      - name: clusterdetails
+        resourceRef:
+          name: cluster-details

openshift-cli/taskUsingClusterResource/resource.yaml

@@ -0,0 +1,17 @@
+apiVersion: tekton.dev/v1alpha1
+kind: PipelineResource
+metadata:
+  name: cluster-details
+spec:
+  type: cluster
+  params:
+  - name: url
+    value: https://api.com
+  - name: name
+    value: oc-test
+  - name: username
+    value: test
+  - name: token
+    value: akakkakaaa
+  - name: cadata
+    value: data

openshift-cli/taskUsingServiceaccount/octask.yaml

@@ -0,0 +1,22 @@
+apiVersion: tekton.dev/v1alpha1
+kind: Task
+metadata:
+  name: task-openshift-command
+  namespace: default
+spec:
+  steps:
+    - name: version
+      image: quay.io/openshift-pipeline/openshift-cli
+      command:
+        - /usr/local/bin/oc
+      args: ["version"]
+    - name: user
+      image: quay.io/openshift-pipeline/openshift-cli
+      command:
+        - /usr/local/bin/oc
+      args: ["whoami"]
+    - name: pods
+      image: quay.io/openshift-pipeline/openshift-cli
+      command:
+        - /usr/local/bin/oc
+      args: ["get", "pods"]

openshift-cli/taskUsingServiceaccount/octaskrun.yaml

@@ -0,0 +1,9 @@
+apiVersion: tekton.dev/v1alpha1
+kind: TaskRun
+metadata:
+  name: task-run-openshift-command
+  namespace: default
+spec:
+  serviceAccount: user
+  taskRef:
+    name: task-openshift-command

openshift-cli/taskUsingServiceaccount/role.yaml

@@ -0,0 +1,9 @@
+kind: Role
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  namespace: default
+  name: get-pod-role
+rules:
+  - apiGroups: [""]
+    resources: ["pods"]
+    verbs: ["get"]

openshift-cli/taskUsingServiceaccount/rolebinding.yaml

@@ -0,0 +1,13 @@
+kind: RoleBinding
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: get-pod-role-binding
+  namespace: default
+subjects:
+  - kind: ServiceAccount
+    name: user
+    namespace: default
+roleRef:
+  kind: Role
+  name: get-pod-role
+  apiGroup: rbac.authorization.k8s.io

openshift-cli/taskUsingServiceaccount/serviceaccount.yaml

@@ -0,0 +1,5 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: user
+  namespace: default