fix: dockerfile updated with multistage build

Signed-off-by: Rajdeep Roy Chowdhury <[email protected]>

Dockerfile

@@ -1,18 +1,26 @@
-FROM alpine:3.20.0
+FROM alpine:3.20.0 as builder
 
 RUN addgroup -S cfpredictorgroup && adduser -S cfpredictor -G cfpredictorgroup
 
 WORKDIR /home/cfpredictor
 
-COPY run.py requirements.txt /home/cfpredictor/
-COPY app ./app
-
-RUN apk add --update --no-cache python3 clang && \
+RUN apk add --update --no-cache python3 clang python3-devel && \
     python3 -m venv .venv && \
     /home/cfpredictor/.venv/bin/python3 -m ensurepip --upgrade && \
     /home/cfpredictor/.venv/bin/pip3 --no-cache install --upgrade pip setuptools && \
     /home/cfpredictor/.venv/bin/pip3 --no-cache install -r requirements.txt
 
+FROM alpine:3.20.0
+
+RUN addgroup -S cfpredictorgroup && adduser -S cfpredictor -G cfpredictorgroup && \
+    apk add --update --no-cache python3
+
+WORKDIR /home/cfpredictor
+
+COPY --from=builder /home/cfpredictor/.venv/ /home/cfpredictor/.venv/
+COPY run.py requirements.txt /home/cfpredictor/
+COPY app ./app
+
 USER cfpredictor
 
-CMD ["python3", "run.py"]
+CMD [".venv/bin/python3", "run.py"]