Add a GitHub Actions workflow to automatically check for Changelog en…

…tries on pull requests (#66)

* Add a GitHub Actions workflow to automatically check for Changelog entries on pull requests

* Add changelog entry

.github/workflows/changelog.yml

@@ -0,0 +1,29 @@
+name: Changelog check
+on:
+  pull_request:
+    types: [assigned, opened, synchronize, reopened, labeled, unlabeled]
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          # Fetch all history
+          fetch-depth: '0'
+
+      - name: Install towncrier
+        run: pip install towncrier
+
+      - name: Check for presence of a Change Log fragment (only pull requests)
+        run: |
+          # Fetch the pull request' base branch so towncrier will be able to
+          # compare the current branch with the base branch.
+          # Source: https://github.com/actions/checkout/#fetch-all-branches.
+          git fetch --no-tags origin ${BASE_BRANCH}
+          towncrier check
+        env:
+          BASE_BRANCH: ${{ github.base_ref }}
+        if: github.event_name == 'pull_request'

news/65.internal

@@ -0,0 +1 @@
+Add a GitHub Actions workflow to automatically check for Changelog entries on pull requests [@ericof]