Add auto-assignee for new PRs (#17753)

Co-authored-by: OrlinVasilev <ovasilev@vmware.com>

.github/auto-assignees.yml

@@ -0,0 +1,24 @@
+---
+# This assigns a PR to its author
+addAssignees: true
+
+addReviewers: false
+
+reviewers:
+  - wy65701436
+  - Vad1mo
+  - OrlinVasilev
+  - stonezdj
+  - chlins
+  - zyyw
+  - MinerYang
+  - AllForNothing
+
+options:
+  ignore_draft: true
+  ignored_keywords:
+    - WIP
+    - wip
+    - DO NOT MERGE
+  enable_group_assignment: true
+  number_of_reviewers: 3

.github/workflows/auto_assign_prs.yml

@@ -0,0 +1,18 @@
+---
+name: "Auto Assign"
+
+# pull_request_target means that this will run on pull requests, but in
+# the context of the base repo. This should mean PRs from forks are supported.
+on:
+  pull_request_target:
+    types: [opened, reopened, ready_for_review]
+
+jobs:
+  # Automatically assigns reviewers and owner
+  add-reviews:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set the author of a PR as the assignee
+        uses: kentaro-m/auto-assign-action@v1.2.4
+        with:
+          configuration-path: ".github/auto-assignees.yml"