Dockerfile hinzugefügt

Dockerfile

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+FROM node:20-alpine AS build
+
+WORKDIR /app
+
+COPY package*.json ./ RUN npm install
+
+COPY . . RUN npm run build
+
+FROM ghcr.io/headlamp-k8s/headlamp:latest
+
+COPY --from=build /app/dist /headlamp/plugins