Add reusable workflow to trigger CodeRabbit review on bot PRs

CodeRabbit has implicit default behavior that automatically skips bot
PRs. The recommended solution is to add a workflow that adds a PR
comment to trigger review. This commit adds a reusable workflow that
centralizes the logic and can be called from a small workflow in
each repository.

Signed-off-by: Tom Pantelis <tompantelis@gmail.com>

Author: tpantelis

.github/workflows/coderabbit-trigger.yml

@@ -0,0 +1,20 @@
+name: Trigger CodeRabbit (Reusable)
+on:
+  workflow_call:
+
+jobs:
+  trigger-coderabbit:
+    runs-on: ubuntu-latest
+    if: github.actor == 'dependabot[bot]' || github.actor == 'submariner-bot'
+    permissions:
+      pull-requests: write
+    steps:
+      - uses: actions/github-script@v8
+        with:
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: '@coderabbitai review'
+            })