new: dev: added a changelog workflow

.github/workflows/changelog.yml

@@ -0,0 +1,33 @@
+name: Update Changelog
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  update-changelog:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.x'
+
+    - name: Install gitchangelog
+      run: |
+        pip install gitchangelog
+
+    - name: Generate Changelog
+      run: |
+        gitchangelog > CHANGELOG.md
+        git config --global user.name 'github-actions[bot]'
+        git config --global user.email 'github-actions[bot]@users.noreply.github.com'
+        git add CHANGELOG.md
+        git commit -m 'chg: doc: update CHANGELOG'
+        git push
+