Update devcontainer configuration with features and settings (#32)

* Update devcontainer configuration with features and settings

* Add devcontainer Dockerfile

* Comment why node

* \n

.devcontainer/Dockerfile

@@ -0,0 +1,3 @@
+FROM mcr.microsoft.com/devcontainers/go:1.25-bookworm
+
+USER vscode

.devcontainer/devcontainer.json

@@ -0,0 +1,33 @@
+{
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/sshd:1": "latest",
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    // Node is here only to support Copilot extension
+    "ghcr.io/devcontainers/features/node:1": {}
+  },
+  "hostRequirements": {
+    "cpus": 8,
+    "memory": "16gb"
+  },
+  "customizations": {
+    "vscode": {
+      // Add the IDs of extensions you want installed when the container is created.
+      "extensions": [
+        "golang.Go",
+        "github.copilot"
+      ],
+      // Set *default* container specific settings.json values on container create.
+      "settings": {
+        "go.toolsManagement.checkForUpdates": "local",
+        "go.useLanguageServer": true,
+        "go.gopath": "/go",
+        "gopls": {
+          "formatting.gofumpt": true
+        }
+      }
+    }
+  }
+}