Dockerfile

# Build stage
FROM golang:1.21-alpine AS builder

WORKDIR /app

# Install git and ca-certificates (needed for go mod download)
RUN apk add --no-cache git ca-certificates

# 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/bot/main.go

# Final stage
FROM alpine:latest

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

WORKDIR /app

# Copy the binary from builder stage and set proper permissions
COPY --from=builder /app/main .
RUN chmod +x main

# Switch to non-root user (nobody user, UID 65534)
USER 65534:65534

# 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 binary
CMD ["./main"]