Orchestrateur go pour lancer la démo et mettre en place plusieurs instances docker

demo/orchestrator/Dockerfile

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+# syntax=docker/dockerfile:1.6
+# Build context attendu : racine du repo LoreMind.
+# Appele depuis demo/docker-compose.infra.yml avec context: ../
+
+# --- Etage 1 : build Angular statique ---
+FROM node:20-alpine AS web-build
+WORKDIR /build
+COPY web/package*.json ./
+RUN npm ci
+COPY web/ .
+RUN npm run build -- --configuration production
+
+# --- Etage 2 : build orchestrateur Go ---
+FROM golang:1.22-alpine AS go-build
+WORKDIR /src
+COPY demo/orchestrator/ ./
+# go mod tidy resout le go.sum au build pour eviter d'avoir a le committer.
+RUN go mod tidy && CGO_ENABLED=0 go build -o /orchestrator .
+
+# --- Etage final : runtime minimal ---
+FROM alpine:3.20
+RUN apk add --no-cache ca-certificates
+WORKDIR /app
+COPY --from=go-build /orchestrator /app/orchestrator
+COPY --from=web-build /build/dist/web /app/static
+COPY demo/orchestrator/preparing.html /app/preparing.html
+EXPOSE 80
+ENV STATIC_DIR=/app/static \
+    PREPARING_PAGE=/app/preparing.html
+ENTRYPOINT ["/app/orchestrator"]