upload coverage only for the linux ci run

Author: dkarrasch

.github/workflows/ci.yml

@@ -30,3 +30,6 @@ jobs:
       - uses: julia-actions/julia-runtest@latest
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v1
+        if: ${{ matrix.version == '1' && matrix.os == 'ubuntu-latest' }}
+        with:
+          file: lcov.info