Dockerfile

# ── Stage 1: Build Go binary ──────────────────────────────────────────────────
FROM golang:1.23-alpine AS go-builder
WORKDIR /app

# Download deps first (cached layer)
COPY Apps/licensemanagerApp/backend/go.mod Apps/licensemanagerApp/backend/go.sum ./
RUN go mod download

# Build
COPY Apps/licensemanagerApp/backend/ .
RUN CGO_ENABLED=0 GOOS=linux go build -o licensemanager ./cmd/server

# ── Stage 2: Build React frontend ─────────────────────────────────────────────
FROM node:20-alpine AS frontend-builder
WORKDIR /frontend

# Install deps first (cached layer).
# Using npm install instead of npm ci because the lock file was generated on Windows
# and omits Linux-specific optional packages (e.g. @emnapi/*) that npm ci requires.
COPY Apps/licensemanagerApp/frontend/package*.json ./
RUN npm install

# Build
COPY Apps/licensemanagerApp/frontend/ .
RUN npm run build

# ── Stage 3: Minimal runtime image ────────────────────────────────────────────
FROM alpine:3.19

# ca-certificates: needed for TLS (PostgreSQL + SMTP over TLS)
# tzdata: needed by the cron scheduler for timezone-aware scheduling
RUN apk add --no-cache ca-certificates tzdata

# Non-root user required by Hugging Face Spaces
RUN addgroup -S app && adduser -S -G app app
WORKDIR /app

COPY --from=go-builder   /app/licensemanager     .
COPY --from=frontend-builder /frontend/dist       ./frontend/dist

RUN chown -R app:app /app
USER app

# PORT=7860 for Hugging Face Spaces; docker-compose.yml overrides to 8080 for local dev
EXPOSE 7860
ENV PORT=7860

CMD ["./licensemanager"]