Disable SELinux enforcement on dev containers

On SELinux-enforcing systems, such as stock Fedora (to be more precise,
in my case, Fedora Silverblue), running `scripts/setup` fails with a
"Permission Denied" error. Fixing the root cause here seemingly
requires mucking around in the devcontainers CLI source, so we just
bail out and use a workaround.

Upstream bug: devcontainers/cli#914

.devcontainer/devcontainer.json

@@ -12,7 +12,7 @@
   },
   // Port 5683 udp is used by Shelly integration
   "appPort": ["8123:8123", "5683:5683/udp"],
-  "runArgs": ["-e", "GIT_EDITOR=code --wait"],
+  "runArgs": ["-e", "GIT_EDITOR=code --wait", "--security-opt", "label=disable"],
   "customizations": {
     "vscode": {
       "extensions": [