Dockerfile.example

# Build stage
FROM golang:1.21-alpine AS builder

WORKDIR /app

# Install required build tools
RUN apk add --no-cache git make

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

# Download dependencies
RUN go mod download

# Copy source code
COPY . .

# Build the application with optimizations
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o main .

# Final stage
FROM alpine:latest

WORKDIR /app

# Add necessary runtime dependencies and security updates
RUN apk --no-cache add ca-certificates tzdata && \
    apk --no-cache upgrade

# Create a non-root user
RUN adduser -D appuser

# Copy the binary from builder
COPY --from=builder /app/main .

# Copy config files
COPY --from=builder /app/config.yaml ./config.yaml

# Set ownership
RUN chown -R appuser:appuser /app

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 8080

# These are example environment variables. Replace with your actual values in production
ENV DB_HOST=your_db_host \
    DB_PORT=3306 \
    DB_USER=your_username \
    DB_NAME=your_database \
    SERVER_PORT=8080

# Run the application
CMD ["./main"]