Add Dev Container configuration

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/base:noble
+
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install cmake libsdl2-dev texinfo

.devcontainer/devcontainer.json

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+{
+	"build": {
+        "dockerfile": "Dockerfile"
+    },
+	"features": {
+		"ghcr.io/devcontainers/features/desktop-lite:1": {},
+		"ghcr.io/devcontainers/features/node:1": {}
+	},
+	"forwardPorts": [6080]
+}

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for more information:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+# https://containers.dev/guide/dependabot
+
+version: 2
+updates:
+ - package-ecosystem: "devcontainers"
+   directory: "/"
+   schedule:
+     interval: weekly