This environment doesn't build its own image — it's a thin passthrough to
nicolaka/netshoot, the de facto
standard Docker network-troubleshooting image. Selecting it in
devmenu.sh/devmenu.ps1 pulls nicolaka/netshoot:latest directly; there's
no "build locally" option and requirements.local.txt customization doesn't
apply here.
netshoot bundles (among others): iproute2, iputils, dig/drill,
curl, nmap, tcpdump, tshark, mtr, iperf3, socat, ngrep,
conntrack, and ss. See the
netshoot README for the full
list and usage notes.