# Dockerfile
FROM docker.io/library/golang:1.23-alpine AS builder

WORKDIR /app

COPY go.mod go.sum ./
RUN go mod download

COPY . .

# Build with optimization flags
# -w -s: Strip debug symbols
RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o /app/observability-core ./cmd/api

# Use Google Distroless static image for minimal size and security
FROM gcr.io/distroless/static:nonroot

WORKDIR /app

COPY --from=builder /app/observability-core .
# Copy configs/migrations if needed at runtime, e.g.:
# COPY --from=builder /app/migrations ./migrations

USER nonroot:nonroot

EXPOSE 8080

CMD ["./observability-core"]