Fix macvtap issues and move to network_mode: host

Dockerfile

@@ -1,4 +1,5 @@
-FROM alpine
-RUN apk add qemu-system-x86_64 qemu-modules bash
+FROM ubuntu
+# iproute2 in Alpine linux does not properly handle macvtap interfaces
+RUN apt-get update && apt-get install -y qemu-kvm bash iproute2
 COPY entrypoint.sh /entrypoint.sh
 ENTRYPOINT /entrypoint.sh