feat(ci): Add changelog workflow (dymensionxyz#720)

Co-authored-by: github-actions <[email protected]>

.github/workflows/changelog.yml

@@ -0,0 +1,44 @@
+# This workflow will add a changelog to the repository when a new commit is pushed to the main branch.
+# E.g., manually edit the commit message to align with conventional commit messages, such as:
+# feat(database): add new indexing capabilities
+# This update introduces advanced indexing options for handling complex queries more efficiently.
+
+name: Changelog Update
+
+on:
+  pull_request:
+    branches:
+      - main
+    types: [opened, synchronize, reopened]
+
+permissions: write-all
+
+jobs:
+  update_changelog:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: "18"
+
+      - name: Install conventional-changelog-cli
+        run: npm install -g conventional-changelog-cli
+
+      - name: Generate changelog diff
+        run: |
+          git fetch origin main:main
+          conventional-changelog -p angular -i CHANGELOG.md -s -r 0 > changelog_diff.md
+          echo "::set-output name=changelog::$(cat changelog_diff.md)"
+      - name: Commit and push changelog update
+        run: |
+          git config user.name 'github-actions'
+          git config user.email '[email protected]'
+          git add CHANGELOG.md
+          git commit -m "Update CHANGELOG.md [skip ci]"
+          git push origin HEAD:refs/heads/${{ github.head_ref }}