feat: fixed global arg error and tidy up code

Dockerfile

@@ -1,7 +1,10 @@
+# Define global args
 ARG MODEL="BAAI/bge-large-en"
 
 FROM debian:bullseye-slim AS build-image
 
+# Include global args in this stage of the build
+ARG MODEL
 ENV MODEL=${MODEL}
 
 COPY ./download.sh ./
@@ -18,24 +21,21 @@ RUN chmod +x *.sh && \
 # Grab a fresh copy of the Python image
 FROM python:3.10-slim
 
+# Include global args in this stage of the build
+ARG MODEL
 ENV MODEL=${MODEL}
 ENV NORMALIZE_EMBEDDINGS=1
+# Set environment variable for the host
+ENV HOST=0.0.0.0
+ENV PORT=7860
 
-RUN mkdir -p ${MODEL} && mkdir -p open/text/embeddings 
 COPY --from=build-image ${MODEL} ${MODEL}
 COPY open/text/embeddings ./open/text/embeddings
 COPY server-requirements.txt ./
-RUN pip install --no-cache-dir -r server-requirements.txt
-
 COPY ./start_server.sh ./
 COPY ./index.html ./
-
-# Make the server start script executable
-RUN chmod +x ./start_server.sh
-
-# Set environment variable for the host
-ENV HOST=0.0.0.0
-ENV PORT=7860
+RUN pip install --no-cache-dir -r server-requirements.txt \
+    chmod +x ./start_server.sh
 
 # Expose a port for the server
 EXPOSE ${PORT}