check for news fragment file

Author: StFroese

.github/workflows/ci.yml

@@ -12,6 +12,7 @@ env:
   NUMBA_NUM_THREADS: 1
   MPLBACKEND: Agg
   PYTEST_ADDOPTS: --color=yes
+  GITHUB_PR_NUMBER: ${{ github.event.number }}
 
 jobs:
   tests:
@@ -152,3 +153,19 @@ jobs:
           FOLDER: docs/_build/html
           CLEAN: true
           SINGLE_COMMIT: true
+
+  changelog:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Set environment
+        run: echo FRAGMENT_NAME="docs/changes/${GITHUB_PR_NUMBER}.*.rst" >> $GITHUB_ENV
+        
+      - name: Check for news fragment
+        uses: andstor/file-existence-action@v2
+        with: 
+          files: ${{ env.FRAGMENT_NAME }}
+          fail: true