fix(ci): avoid coverage artifact conflicts and enable merging of multiple reports

Signed-off-by: Mert Şişmanoğlu <mertssmnoglu@gmail.com>

Author: mertssmnoglu

.github/workflows/ci.yml

@@ -259,7 +259,7 @@ jobs:
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         if: steps.list_env.outputs.nyc != ''
         with:
-          name: coverage
+          name: coverage-${{ strategy.job-index }} # to avoid conflicts
           path: ./coverage
           retention-days: 1
 
@@ -282,8 +282,9 @@ jobs:
       - name: Collect coverage reports
         uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
         with:
-          name: coverage
+          pattern: coverage-* # download all coverage artifacts
           path: ./coverage
+          merge-multiple: true
 
       - name: Merge coverage reports
         shell: bash