Example doesn't work as expected

When I call a command from examples

```
sudo httpjail -vvv --js "true" -- curl https://example.com
16:33:47.852 DEBUG httpjail: Starting httpjail with args: Args { sh: None, js: Some("true"), js_file: None, request_log: None, weak: false, verbose: 3, timeout: None, no_jail_cleanup: false, cleanup: false, server: false, test: None, docker_run: false, command: ["curl", "https://example.com"] }
16:33:47.852 INFO httpjail: Using V8 JavaScript rule evaluation
16:33:47.855 DEBUG httpjail::tls: Loading cached CA certificate from "/root/.config/httpjail/ca-cert.pem"
16:33:47.855 INFO httpjail::tls: Loaded cached CA certificate from /root/.config/httpjail/ca-cert.pem
16:33:47.855 INFO httpjail::tls: Certificate manager initialized
16:33:47.855 DEBUG httpjail::proxy: Created HTTPS client config with 145 trusted roots (including httpjail CA)
16:33:47.855 INFO httpjail::proxy: HTTPS connector initialized with webpki roots and httpjail CA
16:33:47.855 DEBUG httpjail::proxy: Successfully bound to port 8574
16:33:47.855 INFO httpjail::proxy: Starting HTTP proxy on port 8574
16:33:47.855 DEBUG httpjail::proxy: Successfully bound to port 8258
16:33:47.855 INFO httpjail::proxy: Starting HTTPS proxy on port 8258
16:33:47.855 DEBUG httpjail::jail::managed: Starting orphan cleanup scan in "/root/.local/share/httpjail/canaries"
16:33:47.855 DEBUG httpjail::jail::managed: Created canary file for jail 'wekc4una'
16:33:47.855 INFO httpjail::jail::linux: Setting up DNS for namespace httpjail_wekc4una with custom resolv.conf
16:33:47.855 DEBUG httpjail::jail::linux::resources: Created namespace config directory: /etc/netns/httpjail_wekc4una
16:33:47.855 INFO httpjail::jail::linux: Created namespace-specific resolv.conf at /etc/netns/httpjail_wekc4una/resolv.conf with Google DNS servers
16:33:47.857 INFO httpjail::jail::linux::resources: Created network namespace: httpjail_wekc4una
16:33:47.857 INFO httpjail::jail::linux: Created network namespace: httpjail_wekc4una
16:33:47.860 DEBUG httpjail::jail::linux::resources: Created veth pair: vh_wekc4una <-> vn_wekc4una
16:33:47.861 DEBUG httpjail::jail::linux: Created veth pair: vh_wekc4una <-> vn_wekc4una
16:33:47.879 DEBUG httpjail::jail::linux: Configured host side networking for vh_wekc4una
16:33:47.886 INFO httpjail::jail::linux: DNS already configured in namespace httpjail_wekc4una
16:33:47.895 INFO httpjail::jail::linux: Routes in namespace httpjail_wekc4una after configuration:
default via 10.99.183.193 dev vn_wekc4una
10.99.183.192/30 dev vn_wekc4una proto kernel scope link src 10.99.183.194

16:33:47.895 DEBUG httpjail::jail::linux: Configured networking inside namespace httpjail_wekc4una
16:33:47.895 DEBUG httpjail::jail::linux::nftables: Creating nftables table: httpjail_wekc4una
16:33:47.899 INFO httpjail::jail::linux::nftables: Created nftables table httpjail_wekc4una with NAT rules for subnet 10.99.183.192/30
16:33:47.899 INFO httpjail::jail::linux: Set up NAT rules for namespace httpjail_wekc4una with subnet 10.99.183.192/30
16:33:47.899 DEBUG httpjail::jail::linux::nftables: Creating nftables table in namespace httpjail_wekc4una: httpjail
16:33:47.902 INFO httpjail::jail::linux::nftables: Created nftables rules in namespace httpjail_wekc4una for HTTP:8574 HTTPS:8258
16:33:47.902 INFO httpjail::jail::linux: Linux jail setup complete using namespace httpjail_wekc4una with HTTP proxy on port 8574 and HTTPS proxy on port 8258
16:33:47.902 DEBUG httpjail::jail::managed: Created canary file for jail 'wekc4una'
16:33:47.902 INFO httpjail::jail::managed: Started lifecycle heartbeat for jail 'wekc4una'
16:33:47.902 DEBUG httpjail: Setting 6 CA certificate environment variables
16:33:47.902 DEBUG httpjail::jail::linux: Executing command in namespace httpjail_wekc4una: ["curl", "https://example.com"]
16:33:47.902 DEBUG httpjail::jail::managed: Starting heartbeat thread for "/root/.local/share/httpjail/canaries/wekc4una"
16:33:47.902 DEBUG httpjail::jail::linux: Will drop to user 'finkel' (from SUDO_USER) after entering namespace
```

it seems like nothing is happening and the execution never ends