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# ============================================================
# YAUM — Multistage Docker Build
# Produces an ~20 MB single-binary image with zero runtime
# dependencies (Go + SvelteKit frontend embedded).
# ============================================================
# ─────────────────────────────────────────────────────────────
# Stage 1: Build the SvelteKit frontend (static export)
# ─────────────────────────────────────────────────────────────
FROM node:20-alpine AS frontend-builder
WORKDIR /build/frontend
# Install dependencies (layer cached while package*.json stay the same)
COPY frontend/package.json frontend/package-lock.json* ./
RUN npm ci
# Copy source and build
COPY frontend/ ./
RUN npm run build
# Result: /build/frontend/build/ (200.html, _app/, …)
# ─────────────────────────────────────────────────────────────
# Stage 2: Compile the Go backend with the frontend embedded
# ─────────────────────────────────────────────────────────────
FROM golang:1.25-alpine AS backend-builder
WORKDIR /build
# Copy backend source
COPY backend/ ./backend/
# Copy the static export from Stage 1 into the Go embed directory
COPY --from=frontend-builder /build/frontend/build/ ./backend/internal/static/build/
# Build a fully static binary (no libc, no external deps)
WORKDIR /build/backend
RUN CGO_ENABLED=0 \
GOOS=linux \
GOARCH=amd64 \
go build \
-ldflags="-s -w" \
-o /app/yaum \
./cmd/server/
# ─────────────────────────────────────────────────────────────
# Stage 3: Minimal runtime image
# ─────────────────────────────────────────────────────────────
FROM alpine:3.20
# CA certificates so Go can verify TLS on monitored HTTPS URLs
RUN apk add --no-cache ca-certificates tzdata
COPY --from=backend-builder /app/yaum /app/yaum
# Default port; can be overridden at runtime via config.json or env
EXPOSE 8080
WORKDIR /app
CMD ["/app/yaum"]
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