optimize the dockerfile a bit

Dockerfile

@@ -1,35 +1,35 @@
 FROM ubuntu:22.04
 
-# The site space name must be passed as an environment variable
-# https://huggingface.co/docs/hub/spaces-sdks-docker#buildtime
-ARG STATIC_SPACE
-
 # Install Node.js 22 - https://github.com/nodesource/distributions?tab=readme-ov-file#installation-instructions-deb
-RUN apt update
-RUN apt install -y curl
-RUN curl -fsSL https://deb.nodesource.com/setup_22.x -o nodesource_setup.sh
-RUN bash nodesource_setup.sh
-RUN apt install -y nodejs
+# And python3
+RUN apt update \
+    && apt install -y curl python3 python3-pip \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN curl -fsSL https://deb.nodesource.com/setup_22.x -o nodesource_setup.sh \
+    && bash nodesource_setup.sh \
+    && apt update \
+    && apt install -y nodejs \
+    && rm -rf /var/lib/apt/lists/* \
+    && rm nodesource_setup.sh
+
+RUN pip install --upgrade "huggingface_hub[cli]"
+
 # Build the app
 WORKDIR /tmp/app
 COPY svelte-demo/ ./
-RUN npm ci
-RUN npm rebuild
-RUN npm run build
+RUN npm ci && npm rebuild && npm run build
 
-# Install Python 3 and huggingface_hub
-WORKDIR /tmp/python
-RUN apt install -y python3 python3-pip
-RUN pip install --upgrade "huggingface_hub[cli]"
-# Replace the site space with the new build
-RUN mv /tmp/app/dist /tmp/space
-WORKDIR /tmp/space
+# The static space name must be passed as an environment variable
+# https://huggingface.co/docs/hub/spaces-sdks-docker#buildtime
+ARG STATIC_SPACE
 # The Hugging Face token must be passed as a secret (https://huggingface.co/docs/hub/spaces-sdks-docker#buildtime)
-# 1. get README.md from the site space
-RUN --mount=type=secret,id=HF_TOKEN,mode=0444,required=true huggingface-cli download --token=$(cat /run/secrets/HF_TOKEN) --repo-type=space --local-dir=. $STATIC_SPACE README.md
-RUN rm -rf ./.cache
-# 2. upload the new build to the site space, including README.md
-RUN --mount=type=secret,id=HF_TOKEN,mode=0444,required=true huggingface-cli upload --token=$(cat /run/secrets/HF_TOKEN) --repo-type=space $STATIC_SPACE /tmp/space . --delete "*"
+# 1. get README.md from the static space
+RUN --mount=type=secret,id=HF_TOKEN,mode=0444,required=true \
+    huggingface-cli download --token=$(cat /run/secrets/HF_TOKEN) --repo-type=space --local-dir=. $STATIC_SPACE README.md && rm -rf ./.cache
+# 2. upload the new build to the static space, including README.md
+RUN --mount=type=secret,id=HF_TOKEN,mode=0444,required=true \
+    huggingface-cli upload --token=$(cat /run/secrets/HF_TOKEN) --repo-type=space $STATIC_SPACE /tmp/app/dist . --delete "*"
 
 # Halt execution because the code space is not meant to run.
 RUN exit 1