feat: add changelog check workflow for pull requests (#225)

Author: mj-kiwi

.github/workflows/changelog-check.yml

@@ -0,0 +1,19 @@
+name: Check Changelog
+
+on:
+  pull_request:
+    types: [opened, synchronize, labeled, unlabeled]
+
+jobs:
+  check-changelog:
+    name: Check changelog
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check changelog
+        uses: MetaMask/github-tools/.github/actions/check-changelog@v1
+        with:
+          base-branch: ${{ github.event.pull_request.base.ref }}
+          head-ref: ${{ github.head_ref }}
+          labels: ${{ toJSON(github.event.pull_request.labels) }}
+          pr-number: ${{ github.event.pull_request.number }}
+          repo: ${{ github.repository }}