add changelog action

Author: Martin Fenner

.github/workflows/changelog.yml

@@ -0,0 +1,36 @@
+name: Changelog
+
+on:
+  pull_request:
+    types: [closed]
+
+  release:
+    types: [published]
+
+  issues:
+    types: [closed, edited]
+
+jobs:
+  generate_changelog:
+    runs-on: ubuntu-latest
+    name: Generate changelog
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Generate changelog
+        uses: charmixer/auto-changelog-action@v1.1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Commit files
+        run: |
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+          git add CHANGELOG.md && git commit -m 'Updated CHANGELOG.md'
+
+      - name: Push changes
+        uses: ad-m/github-push-action@v0.6.0
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          branch: 'refs/heads/master'
+          tags: false