Fully replace broken .gitpod.yml setup with DevContainer setup

.devcontainer/devcontainer.json

@@ -1,13 +1,17 @@
 {
 	"name": "leeway",
-	"build": {
-		"context": "..",
-		"dockerfile": "../.gitpod.Dockerfile"
+	"image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+	"features": {
+		"ghcr.io/devcontainers/features/node:1": {
+			"version": "lts"
+		},
+		"ghcr.io/devcontainers/features/go:1": {
+			"version": "1.24.0"
+		},
+		"ghcr.io/devcontainers/features/common-utils:2": {},
+		"ghcr.io/devcontainers-contrib/features/shfmt:1": {
+			"version": "3.10.0"
+		}
 	},
-	"runArgs": [
-		"--privileged",
-		"--security-opt=seccomp=unconfined",
-		"--network=host"
-	],
-	"containerUser": "root"
-}
+	"postStartCommand": "./.devcontainer/install-leeway.sh"
+}

.devcontainer/install-leeway.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+# This script downloads and installs the latest version of leeway
+
+set -euo pipefail
+
+# Get the latest leeway version from GitHub API
+LATEST_LEEWAY_VERSION=$(curl -s https://api.github.com/repos/gitpod-io/leeway/releases/latest | jq -r '.tag_name' | sed 's/^v//')
+
+# Ensure we got a valid version
+if [ -z "$LATEST_LEEWAY_VERSION" ]; then
+    echo "Error: Could not determine latest leeway version" >&2
+    exit 1
+fi
+
+echo "Installing leeway version: $LATEST_LEEWAY_VERSION"
+
+# Download the latest leeway release
+curl -L -o /tmp/leeway.tar.gz "https://github.com/gitpod-io/leeway/releases/download/v${LATEST_LEEWAY_VERSION}/leeway_Linux_x86_64.tar.gz"
+
+# Extract the tarball
+tar -xzf /tmp/leeway.tar.gz -C /tmp
+
+# Install leeway to /usr/local/bin
+sudo install -m 755 /tmp/leeway /usr/local/bin/
+
+# Clean up temporary files
+rm /tmp/leeway.tar.gz /tmp/leeway