Cannot use network (not even ping) when using balena-engine

[heekinho]

Description

I cannot use network, or even ping anything when using balena-engine.
If I add --net host it starts working again.

Steps to reproduce the issue:

1. Just run sudo balena-engine run --rm balenalib/amd64-ubuntu:jammy ping 8.8.8.8

Describe the results you received:

$ sudo balena-engine run --rm balenalib/amd64-ubuntu:jammy ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
^C^C--- 8.8.8.8 ping statistics ---
9 packets transmitted, 0 packets received, 100% packet loss

Describe the results you expected:
When using docker, I just get correct output:

$ sudo docker run --rm balenalib/amd64-ubuntu:jammy ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: icmp_seq=0 ttl=56 time=33.608 ms
64 bytes from 8.8.8.8: icmp_seq=1 ttl=56 time=34.124 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=56 time=33.602 ms
^C--- 8.8.8.8 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss

Output of balena-engine version:

Client:
 Version:           dev
 API version:       1.41
 Go version:        go1.17.11
 Git commit:        HEAD
 Built:             Mon Feb  5 13:11:19 2024
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server:
 Engine:
  Version:          dev
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.17.11
  Git commit:       HEAD
  Built:            Mon Feb  5 13:11:19 2024
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.7.19
  GitCommit:        2bf793ef6dc9a18e00cb12efb64355c2c9d5eb41
 runc:
  Version:          unknown
  GitCommit:

Output of balena-engine info:

Client:
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc., v0.16.1)
  compose: Docker Compose (Docker Inc., v2.29.1)

Server:
 Containers: 3
  Running: 2
  Paused: 0
  Stopped: 1
 Images: 6
 Server Version: dev
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host null
  Log: journald json-file local
 Swarm: 
  NodeID: 
  Is Manager: false
  Node Address: 
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: balena-engine-init
 containerd version: 2bf793ef6dc9a18e00cb12efb64355c2c9d5eb41
 runc version: 
 init version: N/A
 Security Options:
  apparmor
  seccomp
   Profile: default
  cgroupns
 Kernel Version: 6.9.3-76060903-generic
 Operating System: Pop!_OS 22.04 LTS
 OSType: linux
 Architecture: x86_64
 CPUs: 12
 Total Memory: 31.03GiB
 Name: pop-os
 ID: IOJY:MHDD:NRXF:RN6O:BHTR:NNQL:AZBK:6OYL:HFCN:WKY6:QT6U:F66G
 Docker Root Dir: /var/lib/balena-engine
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false