Use the new codecov github action to upload coverage reports

Needs solidusio/solidus_dev_support#226

Author: tvdeyen

.github/workflows/test.yml

@@ -52,7 +52,7 @@ jobs:
           - ruby-version: "3.4"
             rails-version: "7.0"
     env:
-      TEST_RESULTS_PATH: coverage/coverage.xml
+      CODECOV_COVERAGE_PATH: ./coverage/coverage.xml
     steps:
       - uses: actions/checkout@v4
       - name: Run extension tests
@@ -67,4 +67,4 @@ jobs:
         continue-on-error: true
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
-          files: ${{ env.TEST_RESULTS_PATH }}
+          files: ${{ env.CODECOV_COVERAGE_PATH }}

Gemfile

@@ -33,3 +33,5 @@ gemspec
 # We use `send` instead of calling `eval_gemfile` to work around an issue with
 # how Dependabot parses projects: https://github.com/dependabot/dependabot-core/issues/1658.
 send(:eval_gemfile, 'Gemfile-local') if File.exist? 'Gemfile-local'
+
+gem "solidus_dev_support", github: "tvdeyen/solidus_dev_support", branch: "new-codecov-uploader"