add new workflow to add status (#805)

* add new workflow to add status

* set as target

* temp

* debug # ci skip

* typo # ci skip

* repo full_name

* only on new PRs

Former-commit-id: 57041f2

Author: scottgigante-immunai

.github/workflows/comment_pull_request.yml

@@ -0,0 +1,16 @@
+name: Comment on Pull Request Status
+
+on:
+  pull_request:
+    types: [opened]
+
+jobs:
+  comment_pr:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: thollander/actions-comment-pull-request@v2
+      with:
+        message: |
+          [![Current build status](https://img.shields.io/github/actions/workflow/status/${{ github.event.pull_request.head.repo.full_name }}/run_tests.yml?branch=${{ github.event.pull_request.head.ref }})](https://github.com/${{ github.event.pull_request.head.repo.full_name }}/actions/workflows/run_tests.yml?query=branch%3A${{ github.event.pull_request.head.ref }})