Store separate artifacts for jobs by name

This change will store the output of the gpmdcov job for comparisons
and debugging.

Signed-off-by: Nicolas Bock <[email protected]>

Author: nicolasbock

.github/workflows/CI.yaml

@@ -87,6 +87,6 @@ jobs:
       - name: Archive example output
         uses: actions/upload-artifact@v2
         with:
-          name: example output
+          name: example output ${{ matrix.JOBNAME }}
           path: |
             examples/gpmdcov/out