feat: Automatically apply label for review + PR comment for draft PRs (…

…#4652)

.github/workflows/pr-welcome.yml

@@ -2,9 +2,11 @@ name: PR Welcome Bot
 
 on:
   pull_request_target:
-    types: [opened]
+    types: [opened, ready_for_review]
     branches:
     - 'main'
+  pull_request_review:
+    types: [submitted, edited]
 
 permissions:
   issues: write
@@ -15,8 +17,21 @@ jobs:
     name: PR Bot
     runs-on: ubuntu-latest
     steps:
-      - name: 'Comment on PR'
-        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7
+      - name: 'Add welcome comment on PR (draft)'
+        uses: actions/github-script@v6
+        if: "github.event.pull_request.draft"
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: ${{ github.event.number }},
+              body: 'Thank you for your contribution! 🙏 Let us know when you are ready for a review by publishing the PR.'
+            });
+      - name: 'Add welcome comment on PR'
+        uses: actions/github-script@v6
+        if: "!github.event.pull_request.draft"
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
@@ -26,3 +41,25 @@ jobs:
               issue_number: ${{ github.event.number }},
               body: 'Thank you for your contribution! 🙏 We will review your PR as soon as possible.\n\n\n While you are waiting, make sure to:\n\n\n- Add an entry in [our changelog](https://github.com/kedacore/keda/blob/main/CHANGELOG.md) in alphabetical order and link related issue\n- Update the [documentation](https://github.com/kedacore/keda-docs), if needed\n- Add unit & [e2e](https://github.com/kedacore/keda/blob/main/tests/README.md) tests for your changes\n- GitHub checks are passing\n- Is the DCO check failing? Here is [how you can fix DCO issues](https://github.com/kedacore/keda/blob/main/CONTRIBUTING.md#i-didnt-sign-my-commit-now-what)\n\n\nLearn more about:\n- Our [contribution guide](https://github.com/kedacore/keda/blob/main/CONTRIBUTING.md)'
             });
+      - name: 'Apply review required label'
+        uses: actions/github-script@v6
+        if: "!github.event.pull_request.draft"
+        with:
+          script: |
+            github.rest.issues.addLabels({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              labels: ["requires-pr-review"]
+            })
+      - name: 'Remove review required label'
+        uses: actions/github-script@v6
+        if: github.event_name == 'pull_request_review' && (github.event.review.state == 'submitted' || github.event.review.state == 'edited')
+        with:
+          script: |
+            github.rest.issues.removeLabel({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              name: "requires-pr-review"
+            })