Merge pull request #9 from pha123661:feat/docker-multi-stage-build

Add multi stage build to optimize the image size

dockerfile

@@ -1,5 +1,5 @@
-FROM python:3.8-slim-buster
-
+# Builder stage: install dependencies and download resources
+FROM python:3.8-slim-buster AS builder
 WORKDIR /app
 
 COPY requirements.txt /app/requirements.txt
@@ -8,8 +8,21 @@ RUN apt-get update && \
     apt-get install --no-install-recommends --yes build-essential wget && \
     pip install --no-cache-dir -r requirements.txt && \
     python -m nltk.downloader punkt_tab && \
-    wget https://dl.fbaipublicfiles.com/fasttext/supervised-models/lid.176.ftz -O lid.176.ftz
+    wget https://dl.fbaipublicfiles.com/fasttext/supervised-models/lid.176.ftz -O lid.176.ftz && \
+    rm -rf /var/lib/apt/lists/*
+
+# Final stage: copy only what is needed
+FROM python:3.8-slim-buster
+WORKDIR /app
+
+# Copy installed Python packages (from the builder)
+COPY --from=builder /usr/local/lib/python3.8/site-packages /usr/local/lib/python3.8/site-packages
+# Copy downloaded file
+COPY --from=builder /app/lid.176.ftz /app/lid.176.ftz
+# Copy requirements if needed for reference (or omit if not necessary)
+COPY --from=builder /app/requirements.txt /app/requirements.txt
 
+# Copy application source code
 COPY ./app/*.py /app
 
 EXPOSE 8000