Swift Package Manager: how do I archive?

I have created a Swift Package via Xcode. This packaged defines a library:

let package = Package(
    name: "SPMBasedA",
    products: [
        .library(
            name: "SPMBasedA",
            type: .static,
            targets: ["SPMBasedA"]),
    ],
    targets: [
        .target(name: "SPMBasedA")
    ]
)

The scheme is well displayed in Xcode and project seems to compile properly, but whenever I archive, there are no products in the exported archive. Why is that, what am I doing wrong? How do I make the build artifacts appear? Is it related to SKIP_INSTALL? If so, how do I disable it in SPM?