feat: Reduce image size from ~930M to ~85M

Dockerfile

@@ -1,7 +1,9 @@
-FROM python:latest
+FROM alpine:latest
+RUN apk update && apk add python3 py3-pip
 ADD . /opt/imgs
 RUN mkdir -p /opt/imgs/uploads
 WORKDIR /opt/imgs
 RUN pip install --upgrade pip && pip install --requirement requirements.txt
+RUN pip install gunicorn
 EXPOSE 5000
 CMD gunicorn imgs:app --bind :5000