Dockerfile

# Build stage
FROM golang:1.21-alpine AS builder

# Set working directory
WORKDIR /app

# Install git (needed for some Go modules)
RUN apk add --no-cache git

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

# Download dependencies
RUN go mod download

# Copy source code
COPY . .

# Build the application
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o main ./cmd/server

# Final stage
FROM alpine:latest

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

# Create non-root user
RUN addgroup -g 1001 -S appgroup && \
    adduser -u 1001 -S appuser -G appgroup

# Set working directory
WORKDIR /app

# Create necessary directories
RUN mkdir -p uploads/images uploads/documents && \
    chown -R appuser:appgroup /app

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

# Copy environment file (optional, can be overridden)
COPY .env.example .env

# Change ownership of the app directory
RUN chown -R appuser:appgroup /app

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1

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