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docs: note Fedora docker0 ZONE_CONFLICT fix for the runner host

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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Josh Bairstow 2026-06-03 00:08:11 +10:00
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@ -170,6 +170,14 @@ sudo snap stop --disable docker.dockerd # if a crashing snap docker is pres
sudo systemctl enable --now docker.service # classic engine, on at boot
docker info | head # verify as your user, no sudo
```
Fedora gotcha: if `dockerd` then fails with
`ZONE_CONFLICT: 'docker0' already bound to 'FedoraWorkstation'` (a stale binding,
often left by a prior snap-docker), free the interface and retry:
```sh
sudo firewall-cmd --permanent --zone=FedoraWorkstation --remove-interface=docker0
sudo firewall-cmd --reload && sudo ip link delete docker0 2>/dev/null
sudo systemctl reset-failed docker.service && sudo systemctl start docker.service
```
### 6. Wire the jb-website repo
In the `jb-website` repo settings on Forgejo (`Settings → Actions`):