Initial Backstage setup

packages/backend/Dockerfile

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+FROM node:18-bookworm-slim
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends python3 g++ build-essential && \
+    rm -rf /var/lib/apt/lists/*
+
+USER node
+
+WORKDIR /app
+
+ENV NODE_ENV=production
+
+COPY --chown=node:node yarn.lock package.json packages/backend/dist/skeleton.tar.gz ./
+RUN tar xzf skeleton.tar.gz && rm skeleton.tar.gz
+
+RUN --mount=type=cache,target=/home/node/.cache/yarn,sharing=locked,uid=1000,gid=1000 \
+    yarn workspaces focus --all --production
+
+COPY --chown=node:node packages/backend/dist/bundle.tar.gz app-config*.yaml ./
+RUN tar xzf bundle.tar.gz && rm bundle.tar.gz
+
+CMD ["node", "packages/backend", "--config", "app-config.yaml", "--config", "app-config.production.yaml"]