Update devcontainer to support docker auto-discovery (#501)

.devcontainer/devcontainer.json

@@ -2,8 +2,10 @@
 // README at: https://github.com/devcontainers/templates/tree/main/src/go
 {
   "name": "Go",
-  // Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-  "image": "golang:1.24-bookworm",
+  // Use bookworm due to
+  // (!) The 'moby' option is not supported on Debian 'trixie' because 'moby-cli' and related system packages have been removed from that distribution.
+  // (!) To continue, either set the feature option '"moby": false' or use a different base image (for example: 'debian:bookworm' or 'ubuntu-24.04').
+  "image": "golang:1.25-bookworm",
   // Features to add to the dev container. More info: https://containers.dev/features.
   "features": {
     // For in-docker discovery testing

examples/docker-discovery/compose.yml

@@ -7,12 +7,16 @@ services:
       - "25565:25565"
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock:ro
+    # Matches MCs below
+    network_mode: bridge
   vanilla:
     image: itzg/minecraft-server
     environment:
       EULA: "TRUE"
     labels:
-      mc-router.host: "vanilla.example.com"
+      mc-router.host: "localhost.itzg.me"
+    # To allow for routing from devcontainer
+    network_mode: bridge
   paper:
     image: itzg/minecraft-server
     environment:
@@ -20,4 +24,6 @@ services:
       TYPE: PAPER
     labels:
       mc-router.host: "paper.example.com"
+    # To allow for routing from devcontainer
+    network_mode: bridge