Add GH action to run prettier on PRs

.github/workflows/prettify-prs.yml

@@ -0,0 +1,23 @@
+name: Continuous Integration
+
+on:
+  pull_request:
+    branches: [develop]
+
+jobs:
+  prettier:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          ref: ${{ github.head_ref }}
+          # Make sure the value of GITHUB_TOKEN will not be persisted in repo's config
+          persist-credentials: false
+      - name: Prettify code
+        uses: creyD/[email protected]
+        with:
+          only_changed: True
+          github_token: ${{ secrets.PERSONAL_GITHUB_TOKEN }}