ci: don't run ignored doctests in coverage tests (#447)

Co-authored-by: Marek Grzelak <git@seqre.dev>

Author: m4tx

.github/workflows/rust.yml

@@ -228,11 +228,17 @@ jobs:
         uses: taiki-e/install-action@cargo-llvm-cov
 
       - name: Generate code coverage
-        run: cargo llvm-cov --all-features --workspace --branch --doctests --codecov --output-path codecov.json -- --include-ignored
+        run: cargo llvm-cov --all-features --workspace --branch --no-report -- --include-ignored
+
+      - name: Generate code coverage - doctests
+        run: cargo llvm-cov --all-features --workspace --branch --doc --no-report
+
+      - name: Merge code coverage reports
+        run: cargo llvm-cov report --codecov --output-path codecov.json
 
       - uses: codecov/codecov-action@v5
         with:
-          files: coverage.json
+          files: codecov.json
           flags: rust
           fail_ci_if_error: true
         env: