support docker without kvm (#282)

desktop_env/providers/docker/provider.py

@@ -97,11 +97,20 @@ class DockerProvider(Provider):
                 self.vlc_port = self._get_available_port(8080)
 
                 # Start container while still holding the lock
+                # Check if KVM is available
+                devices = []
+                if os.path.exists("/dev/kvm"):
+                    devices.append("/dev/kvm")
+                    logger.info("KVM device found, using hardware acceleration")
+                else:
+                    self.environment["KVM"] = "N"
+                    logger.warning("KVM device not found, running without hardware acceleration (will be slower)")
+
                 self.container = self.client.containers.run(
                     "happysixd/osworld-docker",
                     environment=self.environment,
                     cap_add=["NET_ADMIN"],
-                    devices=["/dev/kvm"],
+                    devices=devices,
                     volumes={
                         os.path.abspath(path_to_vm): {
                             "bind": "/System.qcow2",