Process coverage from subpackage (#111)

Author: gdalle

.github/workflows/CI.yml

@@ -38,6 +38,8 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
       - uses: julia-actions/julia-processcoverage@v1
+        with:
+          directories: src,ext,lib
       - uses: codecov/codecov-action@v4
         with:
           files: lcov.info