Upload coverage to codecov

Author: tomas-novotny

.github/workflows/main.yml

@@ -41,5 +41,10 @@ jobs:
 
       - name: Test
         run: |
-          go test -v -race -coverprofile=coverage.out -covermode=atomic ./...
+          go test -v -race -coverprofile=coverage.txt -covermode=atomic ./...
           echo "Coverage: $(go tool cover -func=coverage.out | grep total | awk '{print $3}')"
+
+      - name: Upload to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}