Add devcontainer for Linux development

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/dotnet
+{
+	"name": "C# (.NET)",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/dotnet:1-8.0-bookworm",
+	"features": {
+		"ghcr.io/devcontainers/features/python:1": {
+			"installTools": true,
+			"enableShared": true,
+			"version": "3.12"
+		}
+	},
+
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"ms-dotnettools.csdevkit",
+				"ms-python.python"
+			]
+		}
+	},
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [5000, 5001],
+	// "portsAttributes": {
+	//		"5001": {
+	//			"protocol": "https"
+	//		}
+	// }
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "cd src/ && dotnet restore",
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	"remoteUser": "root",
+	"remoteEnv": {
+		"Python3_ROOT_DIR": "/usr/local/python/current"
+	}
+}

.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

.vscode/settings.json

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+{
+    "dotnet.defaultSolution": "src/CSnakes.sln"
+}