Docker runs on a Linux VM. And Linux don't run XCode or XCTestCase. But I have a solution for you. I'm working on a Native Docker for Mac. It runs XCode images to build, compile and sign apps if you want. I'm looking for beta testers. If you are interested ply to this message, I'll be glad to give you 30 days full access to MacDocker.

@idontcare_ I have the right solution for you! I built a native container system for Mac called MacDocker, where you can run Mach-O binaries straight on macOS. No Linux VM, no emulation and Sandbox/seatbelt isolated. Have you tried to use your M4's GPU with a Docker container? Or build and sign your Swift code in Xcode it? Short answer: you can't. Docker Desktop and Apple Container runs a Linux VM, and it sees no Metal, no MPS, no MLX and no XCode. What Docker Desktop can't do, MacDocker can! 🔥 Real GPU access: PyTorch (MPS) and MLX using Apple Silicon's GPU and unified memory. 🛠️ Xcode in a container: upload your project .zip, get back a .dmg or .ipa signed with your certificate. ⚡ Containers up in ~130 ms: every job starts from an APFS clone (copy-on-write) — disk is used only for what changes. 🔒 Isolated by default: per-job macOS sandbox, dedicated service user, network blocked while running, and caps on memory (GPU included), processes and time. We are looking for beta testers. https://macdocker.com:8000