Add changelog workflow

.github/workflows/changelog.yml

@@ -0,0 +1,31 @@
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+
+name: changelog
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  changelog:
+    name: changelog
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Generate changelog
+        run: |
+          export GH_HOST=github.com
+          gh extension install chelnak/gh-changelog
+          gh changelog new
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v4
+        with:
+          title: "changelog"
+          labels:
+            "maintenance"