Add codespaces devcontainer definition

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/go:1-1.21-bullseye
+RUN sudo apt-get update && sudo apt-get install -y fzf zsh-antigen
+RUN sudo chsh -s $(which zsh) vscode

.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/go
+{
+	"name": "Go",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"build": {
+		"dockerfile": "Dockerfile",
+		"context": "."
+	},
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"golang.go",
+				"GitHub.copilot",
+				"GitHub.copilot-chat",
+				"DavidAnson.vscode-markdownlint",
+				"stkb.rewrap"
+			],
+			"settings": {
+				"terminal.integrated.defaultProfile.linux": "zsh"
+			}
+		}
+	},
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	"features": {
+		"ghcr.io/devcontainers/features/sshd:1": {
+			"version": "latest"
+		}
+	},
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "",
+	// Configure tool-specific properties.
+	// "customizations": {},
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

.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