several react apps with express server

Question

The idea is to make a lot of separate react apps on the one express server, so each of them should appear using the url something like mysite.com/app1, mysite.com/app2 etc

my express code:

const path = require('path');
const app = express();

app.use('/',express.static(path.join(__dirname, './public'))); // just a simple html, not a react
app.use('/app1',express.static(path.join(__dirname, './public/build-1'))); // react
app.use('/app2',express.static(path.join(__dirname, './public/build-2'))); // react

app.get('/', (req, res) => {
    res.sendFile(path.join(__dirname, 'public', 'index.html'));
});

app.get('/app1/*', (req, res) => {
    res.sendFile(path.join(__dirname, 'public/build-1', 'index.html'));
});

app.get('/app2/*', (req, res) => {
    res.sendFile(path.join(__dirname, 'public/build-2', 'index.html'));
});


const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
    console.log(`Server is running on port ${PORT}`)
});

so, actually this works

but there's a problem - when visiting the root url of the site - mysite.com - I get the ordinary index.html file, not a react one, as expected, but using the path - mysite.com/app1 or mysite.com/app2 - the url changes to just mysite.com and the app1 or app2 launches from the root of the site, not staying on the route mysite.com/app1 or mysite.com/app2

and yep, I did configure the react's package.json file for both of the apps

{"homepage": "http://localhost:3000/app1"}

and

{"homepage": "http://localhost:3000/app2"}

the problem has been found: the route I configured in the React App rewrote the url path to the root, so that's why the bug occured