ci(mergify): use mergify to request reviewers (#1657)

Signed-off-by: Thuan Vo <[email protected]>

.github/workflows/pr-request-review.yml

@@ -8,22 +8,12 @@ on:
 jobs:
   request-review:
     runs-on: ubuntu-latest
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     permissions:
       pull-requests: write
     if: github.repository_owner == 'cryostatio' && github.event.issue.pull_request && startsWith(github.event.comment.body, '/request_review')
-    env:
-      REVIEWERS_TEAM: 'cryostatio/reviewers'
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Add label and request review
-        run: |
-          echo "Adding label 'review-requested' to the PR"
-          gh pr edit ${{ github.event.issue.number }} --add-label "review-requested"
-
-          echo "Requesting review from @$REVIEWERS_TEAM"
-          gh pr edit ${{ github.event.issue.number }} --add-reviewer $REVIEWERS_TEAM
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
+      - run: |
+          # Adding label 'review-requested' to the PR. Mergify will add reviewers.
+          gh pr edit ${{ github.event.issue.number }} --add-label "review-requested" --repo ${{ github.event.repository.full_name }}

.mergify.yml

@@ -39,3 +39,22 @@ pull_request_rules:
             is updated. Please revert or drop all changes to the `web-client` submodule from this PR and perform any
             required frontend work by opening and merging a PR against
             [cryostat-web](https://github.com/cryostatio/cryostat-web).
+
+  - name: request reviews from the reviewers team
+    conditions:
+      - label=review-requested
+    actions:
+      request_reviews:
+        teams:
+          - "@cryostatio/reviewers"
+
+  - name: remove review-requested label upon reviewing
+    conditions:
+      - or:
+        - "#approved-reviews-by>0"
+        - "#changes-requested-reviews-by>0"
+        - "#commented-reviews-by>0"
+    actions:
+      label:
+        remove:
+          - review-requested