ci: add github action to trigger E2E

based on the discussion on the slack
channel. we are adding a github action
to trigger the CI jobs when a ok-to-test
label is added on the PR.

This action is based on below github action
https://github.com/peter-evans/create-or-update-comment

Sample Demo avaiable at
https://github.com/Madhu-1/
\label-commentor-action-testing/pull/4

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

.github/workflows/pull-request-commentor.yaml

@@ -0,0 +1,90 @@
+---
+name: Add comment
+# yamllint disable-line rule:truthy
+on:
+  pull_request_target:
+    types:
+      - labeled
+jobs:
+  add-comment:
+    if: github.event.label.name == 'ok-to-test'
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Add comment to trigger external storage tests for Kubernetes 1.22
+        uses: peter-evans/create-or-update-comment@v2
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            /test ci/centos/k8s-e2e-external-storage/1.22
+
+      - name: Add comment to trigger external storage tests for Kubernetes 1.23
+        uses: peter-evans/create-or-update-comment@v2
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            /test ci/centos/k8s-e2e-external-storage/1.23
+
+      - name: Add comment to trigger external storage tests for Kubernetes 1.24
+        uses: peter-evans/create-or-update-comment@v2
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            /test ci/centos/k8s-e2e-external-storage/1.24
+
+      - name: Add comment to trigger helm E2E tests for Kubernetes 1.22
+        uses: peter-evans/create-or-update-comment@v2
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            /test ci/centos/mini-e2e-helm/k8s-1.22
+
+      - name: Add comment to trigger helm E2E tests for Kubernetes 1.23
+        uses: peter-evans/create-or-update-comment@v2
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            /test ci/centos/mini-e2e-helm/k8s-1.23
+
+      - name: Add comment to trigger helm E2E tests for Kubernetes 1.24
+        uses: peter-evans/create-or-update-comment@v2
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            /test ci/centos/mini-e2e-helm/k8s-1.24
+
+      - name: Add comment to trigger E2E tests for Kubernetes 1.22
+        uses: peter-evans/create-or-update-comment@v2
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            /test ci/centos/mini-e2e/k8s-1.22
+
+      - name: Add comment to trigger E2E tests for Kubernetes 1.23
+        uses: peter-evans/create-or-update-comment@v2
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            /test ci/centos/mini-e2e/k8s-1.23
+
+      - name: Add comment to trigger E2E tests for Kubernetes 1.24
+        uses: peter-evans/create-or-update-comment@v2
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            /test ci/centos/mini-e2e/k8s-1.24
+
+      - name: Add comment to trigger cephfs upgrade tests
+        uses: peter-evans/create-or-update-comment@v2
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            /test ci/centos/upgrade-tests-cephfs
+
+      - name: Add comment to trigger rbd upgrade tests
+        uses: peter-evans/create-or-update-comment@v2
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            /test ci/centos/upgrade-tests-rbd