This is a Development Container to provide a one-click full development environment with all the needed tools and configurations, to develop and test FreshRSS.
It can be used on your local machine (see for instance the Dev Containers extension for Visual Studio Code), or as GitHub Codespaces simply in a Web browser:
A test instance of FreshRSS is automatically started as visible from the Ports tab: check the Local Address column, and click on the Open in browser 🌐 icon. It runs the FreshRSS code that you are currently editing.
Running the tests can be done directly from the built-in terminal, e.g.:
make test-all