Update Dockerfile

Dockerfile

@@ -2,18 +2,16 @@ FROM python:3.7-alpine as base
 
 FROM base as builder
 
-RUN mkdir /install
-WORKDIR /install
-
-COPY requirements.txt /requirements.txt
-
-RUN pip install --install-option="--prefix=/install" -r /requirements.txt
+# add build utils (gcc, others)
+RUN apk add build-base
 
 FROM base
 
-COPY --from=builder /install /usr/local
 COPY . /bumper
 
 WORKDIR /bumper
 
-ENTRYPOINT ["python3", "-m", "bumper"]
+# install required python packages
+RUN pip3 install -r requirements.txt
+
+ENTRYPOINT ["python3", "-m", "bumper"]