Implement workflow that adds new feature label to PRs automatically (#195)

* Add `new feature` checklist item

* Create auto-label-pr-new-feature.yml

* Fix grammar

* Fix wording

Author: josh-wong

.github/pull_request_template.md

@@ -2,13 +2,15 @@
 
 > Replace this text with a brief description about **why** this PR is necessary. Be sure to provide context.
 
+- [ ] This PR includes a new feature.
+
 ## Related issues and/or PRs
 
 > Replace this text with links to any existing issues and/or PRs. Or, write `N/A` if no related issues and/or PRs exist.
 
 ## Changes made
 
-> Replace this text with an outline the specific changes made in this pull request in the form of a bulleted list. Include relevant details, such as added features, bug fixes, code refactoring, or improvements.
+> Replace this text with an outline of the specific changes made in this pull request in the form of a bulleted list. Include relevant details, such as added features, bug fixes, code refactoring, or improvements.
 
 <h2 id="checklist">Checklist</h2>
 

.github/workflows/auto-label-pr-new-feature.yml

@@ -0,0 +1,32 @@
+name: Add `new feature` label to PR
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize]
+
+jobs:
+  manage-feature-label:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get PR body
+        id: pr_body
+        run: |
+          echo "body<<EOF" >> $GITHUB_OUTPUT
+          echo "${{ github.event.pull_request.body }}" >> $GITHUB_OUTPUT
+          echo "EOF" >> $GITHUB_OUTPUT
+
+      - name: Add 'new feature' label if checked
+        if: contains(steps.pr_body.outputs.body, '- [x] This PR includes a new feature.') || contains(steps.pr_body.outputs.body, '- [x] This PR includes a new feature.')
+        uses: actions-ecosystem/action-add-labels@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: new feature
+
+      - name: Remove 'new feature' label if unchecked
+        if: |
+          !contains(steps.pr_body.outputs.body, '- [x] This PR includes a new feature.') &&
+          !contains(steps.pr_body.outputs.body, '- [x] This PR includes a new feature.')
+        uses: actions-ecosystem/action-remove-labels@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: new feature