Either click on the 'Open in DevPod' link above or start via devpod up github.com/loft-sh/devpod-example-go. This will start a small devcontainer that has all the needed tools to start working on a go server.
It will also serve static files on port 4000 and forward it to your local machine.
After creating your workspace, run go run main.go to start the server.