Add Github Action to add a commit with #run-e2e-tests (facebook#41311)

Summary:
facebook#41308 introduce the possibility to run e2e tests if a commit contains #run-e2e-tests in the commit message.
This PR builds on top of that, and let users to run e2e tests by adding a comment with with #run-e2e-tests

## Changelog:
[Internal] - Allow to run e2e tests from comments

Pull Request resolved: facebook#41311

Test Plan: Not sure it can be tested until the PR is merged... ¯\_(ツ)_/¯

Reviewed By: dmytrorykun

Differential Revision: D51111543

Pulled By: cipolleschi

fbshipit-source-id: e6c55950552f03830fa35c89d385ab9b17f8facb

.github/workflows/run_e2e_tests.yml

@@ -0,0 +1,26 @@
+name: Run E2E Tests
+# This workflow is used to trigger E2E tests on a PR when a comment is made
+# containing the text "#run-e2e-tests".
+on:
+  issue_comment:
+    types: [created]
+permissions:
+  contents: read
+jobs:
+  rebase:
+    name: Trigger E2E Tests
+    permissions:
+      contents: write # for cirrus-actions/rebase to push code to rebase
+      pull-requests: read # for cirrus-actions/rebase to get info about PR
+    runs-on: ubuntu-latest
+    if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '#run-e2e-tests')
+    steps:
+      - name: Checkout the latest code
+        uses: actions/checkout@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          fetch-depth: 0 # otherwise, you will fail to push refs to dest repo
+      - name: Push empty commit
+        run: |
+          git commit -m "#run-e2e-tests" --allow-empty
+          git push origin $(git branch --show-current)