Fix devcontainer configuration drift

- Remove inaccessible shfmt feature that was causing build failures
- Specify exact runtime versions (Go 1.24, Node 18) for consistency
- Move leeway installation from postStartCommand to Dockerfile for proper global dependency management
- Add port forwarding configuration (8080, 3000, 9000) with descriptions
- Create comprehensive automations file with development workflows:
  - install-deps: Download Go dependencies (auto-triggered)
  - build-leeway: Build main application (manual)
  - test: Run Go tests (manual)
  - lint: Run linter if available (manual)
- Remove obsolete install-leeway.sh script

Fixes dev container build failure and establishes proper development environment
following Gitpod development setup guidelines.

Author: akosyakov

.devcontainer/Dockerfile

@@ -0,0 +1,10 @@
+FROM mcr.microsoft.com/devcontainers/base:ubuntu
+
+# Install leeway build tool
+RUN bash -c 'set -euo pipefail && \
+    LATEST_LEEWAY_VERSION=$(curl -s https://api.github.com/repos/gitpod-io/leeway/releases/latest | jq -r ".tag_name" | sed "s/^v//") && \
+    echo "Installing leeway version: $LATEST_LEEWAY_VERSION" && \
+    curl -L -o /tmp/leeway.tar.gz "https://github.com/gitpod-io/leeway/releases/download/v${LATEST_LEEWAY_VERSION}/leeway_Linux_x86_64.tar.gz" && \
+    tar -xzf /tmp/leeway.tar.gz -C /tmp && \
+    install -m 755 /tmp/leeway /usr/local/bin/ && \
+    rm /tmp/leeway.tar.gz /tmp/leeway'

.devcontainer/devcontainer.json

@@ -1,15 +1,32 @@
 {
 	"name": "leeway",
-	"image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+	"build": {
+		"dockerfile": "Dockerfile"
+	},
 	"features": {
-		"ghcr.io/devcontainers/features/node:1": {},
-		"ghcr.io/devcontainers/features/go:1": {},
-		"ghcr.io/devcontainers/features/common-utils:2": {},
-		"ghcr.io/devcontainers-contrib/features/shfmt:1": {
-			"version": "3.10.0"
+		"ghcr.io/devcontainers/features/node:1": {
+			"version": "18"
+		},
+		"ghcr.io/devcontainers/features/go:1": {
+			"version": "1.24"
 		},
+		"ghcr.io/devcontainers/features/common-utils:2": {},
 		"ghcr.io/dhoeric/features/google-cloud-cli:1": {},
-		"ghcr.io/devcontainers/features/aws-cli:1": {},
+		"ghcr.io/devcontainers/features/aws-cli:1": {}
 	},
-	"postStartCommand": "./.devcontainer/install-leeway.sh"
+	"forwardPorts": [8080, 3000, 9000],
+	"portsAttributes": {
+		"8080": {
+			"label": "Application Server",
+			"onAutoForward": "notify"
+		},
+		"3000": {
+			"label": "Development Server",
+			"onAutoForward": "notify"
+		},
+		"9000": {
+			"label": "Debug Server",
+			"onAutoForward": "notify"
+		}
+	}
 }

.devcontainer/install-leeway.sh

@@ -0,0 +1,48 @@
+tasks:
+  install-deps:
+    name: Install Go Dependencies
+    description: Download and cache Go module dependencies
+    command: |
+      echo "Installing Go dependencies..."
+      go mod download
+      echo "Go dependencies installed successfully"
+    triggeredBy:
+      - postDevcontainerStart
+
+  build-leeway:
+    name: Build Leeway Application
+    description: Build the main leeway application
+    command: |
+      echo "Building leeway application..."
+      go build -o bin/leeway .
+      echo "Leeway application built successfully"
+    dependsOn:
+      - install-deps
+
+  test:
+    name: Run Tests
+    description: Run Go tests for the project
+    command: |
+      echo "Running tests..."
+      go test ./...
+      echo "Tests completed"
+    dependsOn:
+      - install-deps
+    triggeredBy:
+      - manual
+
+  lint:
+    name: Run Linter
+    description: Run golangci-lint on the codebase
+    command: |
+      echo "Running linter..."
+      if command -v golangci-lint >/dev/null 2>&1; then
+        golangci-lint run
+      else
+        echo "golangci-lint not available, skipping lint check"
+      fi
+      echo "Linting completed"
+    dependsOn:
+      - install-deps
+    triggeredBy:
+      - manual