Distinguish between Appveyor and github-action

Right now, the Codecov UI displays downloads in a confusing way:
You get an "appveyor" header, and then 2 list items with links to
appveyor, followed by one list item with a link to Github.

We didn't specify that appveyor name anywhere, maybe Codecov behaves
differently on that platform. Let us see if specifying names for each
system makes things clearer.

.appveyor.yml

@@ -124,4 +124,4 @@ test_script:
 
 after_test:
   - appveyor DownloadFile https://codecov.io/bash -FileName codecov.sh
-  - bash codecov.sh -f clover.xml
+  - bash codecov.sh -f clover.xml -n "AppVeyor $env:db $env:db_version $env:driver $env:php"

.github/workflows/continuous-integration.yml

@@ -679,5 +679,6 @@ jobs:
         with:
           directory: reports
           fail_ci_if_error: true
+          name: github-action
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}