Upload errors on failure

.github/workflows/test-cygwin.yml

@@ -62,6 +62,18 @@ jobs:
         run: |
           bash.exe xvfb-run -s '-screen 0 1024x768x24' .ci/test.sh
 
+      - name: Prepare to upload errors
+        if: failure()
+        run: |
+          mkdir -p Tests/errors
+
+      - name: Upload errors
+        uses: actions/upload-artifact@v2
+        if: failure()
+        with:
+          name: errors
+          path: Tests/errors
+
       - name: After success
         run: |
           bash.exe .ci/after_success.sh
@@ -73,13 +85,6 @@ jobs:
           flags: GHA_Cygwin
           name: Cygwin Python 3.${{ matrix.python-minor-version }} ${{ matrix.architecture }}
 
-      - name: After failure
-        if: failure()
-        run: |
-          C:\tools\cygwin\bin\uname -a
-          C:\tools\cygwin\bin\python3.8 -m pip list
-          C:\tools\cygwin\bin\python3.8 -m pip show --files Pillow
-
   success:
     needs: build
     runs-on: ubuntu-latest