chore(ci): Apply doc needed label automatically on PRs (#733)

.github/labeler.yml

@@ -0,0 +1,3 @@
+# Add/remove 'doc needed' label if issue/PR contains the line '- [x] This PR requires documentation updates when merged.'
+"doc needed":
+  - '- \[x\] This PR requires documentation updates when merged.'

.github/pull_request_template.md

@@ -25,6 +25,7 @@ Resolves # <!-- link to issue -->
 - [ ] I have [linked](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue) this PR to the issue(s) that it resolves.
 - [ ] I have reviewed the changes on GitHub, line by line.
 - [ ] I have ensured all changes are covered in the description.
+- [ ] This PR requires documentation updates when merged.
 
 # Additional context
 

.github/workflows/labeler.yml

@@ -0,0 +1,22 @@
+name: "Labeler"
+on:
+  pull_request_target:
+    types:
+      - opened
+      - reopened
+      - edited
+      - synchronize
+
+permissions:
+  pull-requests: write
+  contents: read
+
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: github/issue-labeler@v2.6
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          configuration-path: .github/labeler.yml
+          enable-versioned-regex: 0