Dockerfile

# Multi-stage build for Go application
# Stage 1: Build stage
FROM golang:1.24-alpine AS builder

# Install build dependencies
RUN apk add --no-cache git build-base

# Set working directory
WORKDIR /app

# Copy go mod and sum files
COPY go.mod go.sum ./

# Download dependencies
RUN go mod download

# Install swag for generating documentation
RUN go install github.com/swaggo/swag/cmd/swag@latest

# Copy source code
COPY . .

# Generate swagger documentation
RUN swag init -g main/main.go -o ./docs

# Create build directory (matching Makefile structure)
RUN mkdir -p build

# Build the application (following Makefile build command)
RUN go build -o build/API main/*

# Stage 2: Runtime stage
FROM alpine:latest

# Install ca-certificates for HTTPS calls
RUN apk --no-cache add ca-certificates

# Create a non-root user
RUN addgroup -S appgroup && adduser -S appuser -G appgroup

# Set working directory
WORKDIR /app

# Copy the binary from builder stage
COPY --from=builder /app/build/API ./API

# Copy the the template directory
COPY --from=builder /app/templates ./templates

# Copy docs directory for swagger documentation
COPY --from=builder /app/docs ./docs


# Change ownership to non-root user
RUN chown -R appuser:appgroup /app

# Switch to non-root user
USER appuser

# Expose port 8000 (as defined in main.go)
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:8000/api/health || exit 1

# Command to run the application
CMD ["./API"]