Dockerfile

# Build stage
FROM golang:1.24-alpine AS builder

WORKDIR /app

# Install git for fetching dependencies
RUN apk add --no-cache git

# Copy go mod files first for better caching
COPY go.mod go.sum ./
RUN go mod download

# Copy source code
COPY . .

# Build the binary
RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o /server ./cmd/server

# Runtime stage
FROM alpine:3.19

# Add ca-certificates for HTTPS and tzdata for timezones
RUN apk --no-cache add ca-certificates tzdata

WORKDIR /app

# Copy binary from builder
COPY --from=builder /server .

# Create non-root user
RUN adduser -D -g '' appuser
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 server
ENTRYPOINT ["./server"]