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deploy/prod/Dockerfile.frontend

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+# Build-only image for the Vue frontend.
+# It is never run as a service: ansible builds this image once, runs it
+# with the host output directory bind-mounted at /output, the container
+# copies the compiled static build into it, and exits. Nginx on the host
+# then serves that directory directly.
+
+FROM node:20-alpine AS build
+WORKDIR /app
+COPY package.json package-lock.json ./
+COPY extras/ ./extras/
+RUN npm ci
+COPY . .
+RUN npm run build
+
+FROM alpine AS export
+COPY --from=build /app/dist /dist
+VOLUME /output
+CMD ["sh", "-c", "rm -rf /output/* && cp -a /dist/. /output/"]