feat: add Just build automation with comprehensive recipes

- Create justfile with development and production recipes
- Add Docker build and run commands with proper configuration
- Include database management utilities and migration helpers
- Add development setup and dependency management
- Create configuration help and documentation commands
- Support both SQLite and MySQL deployment scenarios

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

justfile

@@ -0,0 +1,166 @@
+# OpenAccounting Server - Just recipes
+# https://github.com/casey/just
+
+# Default recipe
+default:
+    @just --list
+
+# Variables
+image_name := "openaccounting-server"
+tag := "latest"
+
+# Build the Go application
+build:
+    @echo "Building OpenAccounting Server..."
+    go build -o server ./core/
+
+# Run the server locally
+run: build
+    @echo "Starting server locally..."
+    ./server
+
+# Run with custom environment
+run-dev: build
+    @echo "Starting server in development mode..."
+    OA_DATABASE_DRIVER=sqlite OA_DATABASE_FILE=./dev.db OA_PORT=8080 ./server
+
+# Run tests
+test:
+    @echo "Running tests..."
+    go test ./...
+
+# Clean build artifacts
+clean:
+    @echo "Cleaning up..."
+    rm -f server
+    rm -f *.db
+
+# Docker recipes
+
+# Build Docker image
+docker-build:
+    @echo "Building Docker image: {{image_name}}:{{tag}}"
+    docker build -t {{image_name}}:{{tag}} .
+
+# Run container with SQLite (development)
+docker-run: docker-build
+    @echo "Running container with SQLite..."
+    docker run --rm -p 8080:8080 \
+        -e OA_DATABASE_DRIVER=sqlite \
+        -e OA_DATABASE_FILE=/app/data/openaccounting.db \
+        -v $(pwd)/data:/app/data \
+        {{image_name}}:{{tag}}
+
+# Run container with MySQL (production example)
+docker-run-mysql: docker-build
+    @echo "Running container with MySQL (requires external MySQL)..."
+    docker run --rm -p 8080:8080 \
+        -e OA_DATABASE_DRIVER=mysql \
+        -e OA_DATABASE_ADDRESS=mysql:3306 \
+        -e OA_DATABASE=openaccounting \
+        -e OA_USER=openaccounting \
+        -e OA_PASSWORD=secret \
+        {{image_name}}:{{tag}}
+
+# Run with docker-compose (if you create one)
+docker-compose-up:
+    @echo "Starting with docker-compose..."
+    docker-compose up -d
+
+docker-compose-down:
+    @echo "Stopping docker-compose..."
+    docker-compose down
+
+# Development utilities
+
+# Format code
+fmt:
+    @echo "Formatting code..."
+    go fmt ./...
+
+# Lint code (requires golangci-lint)
+lint:
+    @echo "Linting code..."
+    golangci-lint run
+
+# Install development dependencies
+install-deps:
+    @echo "Installing development dependencies..."
+    go mod download
+    go mod vendor
+
+# Update dependencies
+update-deps:
+    @echo "Updating dependencies..."
+    go get -u ./...
+    go mod tidy
+    go mod vendor
+
+# Database utilities
+
+# Create SQLite database directory
+init-db:
+    @echo "Creating database directory..."
+    mkdir -p data
+
+# Reset SQLite database
+reset-db:
+    @echo "Resetting SQLite database..."
+    rm -f *.db data/*.db
+
+# Migration recipes
+
+# Run database migrations manually (if needed)
+migrate:
+    @echo "Running database migrations..."
+    go run ./core/ --migrate-only || echo "Migration command not implemented yet"
+
+# Production utilities
+
+# Build for production
+build-prod:
+    @echo "Building for production..."
+    CGO_ENABLED=1 GOOS=linux go build -a -installsuffix cgo -ldflags="-w -s" -o server ./core/
+
+# Create release tarball
+release: build-prod
+    @echo "Creating release package..."
+    tar -czf openaccounting-server-$(date +%Y%m%d).tar.gz server config.json.sample README.md
+
+# Security scan (requires trivy)
+security-scan:
+    @echo "Scanning Docker image for vulnerabilities..."
+    trivy image {{image_name}}:{{tag}}
+
+# Show configuration help
+config-help:
+    @echo "OpenAccounting Server Configuration:"
+    @echo ""
+    @echo "Environment Variables (prefix with OA_):"
+    @echo "  OA_ADDRESS                Server address (default: localhost)"
+    @echo "  OA_PORT                   Server port (default: 8080)"
+    @echo "  OA_API_PREFIX             API prefix (default: /api/v1)"
+    @echo "  OA_DATABASE_DRIVER        Database driver: sqlite or mysql (default: sqlite)"
+    @echo "  OA_DATABASE_FILE          SQLite database file (default: ./openaccounting.db)"
+    @echo "  OA_DATABASE_ADDRESS       MySQL address (e.g., localhost:3306)"
+    @echo "  OA_DATABASE               MySQL database name"
+    @echo "  OA_USER                   Database username"
+    @echo "  OA_PASSWORD               Database password (recommended for security)"
+    @echo "  OA_MAILGUN_DOMAIN         Mailgun domain"
+    @echo "  OA_MAILGUN_KEY            Mailgun API key (recommended for security)"
+    @echo "  OA_MAILGUN_EMAIL          Mailgun email"
+    @echo "  OA_MAILGUN_SENDER         Mailgun sender name"
+    @echo ""
+    @echo "Examples:"
+    @echo "  Development: OA_DATABASE_DRIVER=sqlite OA_PORT=8080 ./server"
+    @echo "  Production:  OA_DATABASE_DRIVER=mysql OA_PASSWORD=secret ./server"
+
+# All-in-one development setup
+dev-setup: install-deps init-db build
+    @echo "Development setup complete!"
+    @echo "Run 'just run-dev' to start the server"
+
+# All-in-one production build
+prod-build: clean build-prod docker-build
+    @echo "Production build complete!"
+    @echo "Run 'just docker-run' to test the container"