fix os.version shim, improve docker image

Dockerfile

@@ -1,12 +1,6 @@
+# Build shim-loader.js
 FROM node:20-slim AS build
 
-RUN apt-get update && apt-get install -y --no-install-recommends \
-  ca-certificates \
-  curl \
-  binutils \
-  xz-utils \
-  && rm -rf /var/lib/apt/lists/*
-
 WORKDIR /build
 
 COPY package.json package-lock.json ./
@@ -14,49 +8,37 @@ RUN npm ci --ignore-scripts
 
 COPY build.js ./
 COPY shims/ ./shims/
-COPY scripts/ ./scripts/
-COPY server/ ./server/
 
 RUN npm run build:shims
 
-
-ARG OBSIDIAN_VERSION=1.8.9
-RUN curl -fSL "https://github.com/obsidianmd/obsidian-releases/releases/download/v${OBSIDIAN_VERSION}/obsidian_${OBSIDIAN_VERSION}_amd64.deb" \
-  -o /tmp/obsidian.deb \
-  && mkdir -p /tmp/obsidian-deb \
-  && ar x /tmp/obsidian.deb --output=/tmp/obsidian-deb \
-  && mkdir -p /tmp/obsidian-pkg \
-  && tar -xf /tmp/obsidian-deb/data.tar.xz -C /tmp/obsidian-pkg \
-  && rm -rf /tmp/obsidian.deb /tmp/obsidian-deb
-
-
-RUN npx --yes @electron/asar extract \
-  /tmp/obsidian-pkg/opt/Obsidian/resources/obsidian.asar \
-  /build/obsidian-app \
-  && rm -rf /tmp/obsidian-pkg
-
-# Patch index.html
-RUN node scripts/patch-obsidian.js /build/obsidian-app
-
-RUN cp dist/shim-loader.js /build/obsidian-app/shim-loader.js
-
-# Production image
+# Production image. No Obsidian code included.
+# On first run, the entrypoint downloads and patches Obsidian.
 FROM node:20-slim
 
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  ca-certificates curl binutils xz-utils \
+  && rm -rf /var/lib/apt/lists/*
+
 WORKDIR /app
 
 COPY package.json package-lock.json ./
 RUN npm ci --omit=dev --ignore-scripts
 
 COPY server/ ./server/
-COPY --from=build /build/obsidian-app ./obsidian-app
+COPY scripts/ ./scripts/
+COPY images/ ./images/
+COPY --from=build /build/dist ./dist
+
+RUN chmod +x /app/scripts/entrypoint.sh
 
 ENV PORT=8080
 ENV VAULT_ROOT=/vaults
+ENV OBSIDIAN_VERSION=1.8.9
 ENV OBSIDIAN_ASSETS_PATH=/app/obsidian-app
 
 EXPOSE 8080
 
 VOLUME /vaults
+VOLUME /app/obsidian-app
 
-CMD ["node", "server/index.js"]
+ENTRYPOINT ["/app/scripts/entrypoint.sh"]