Change the Docker base image from python:3-slim to python:3-alpine.

The final image will be ~79.6MB instead of 163MB. It has 48% smaller.

.dockerignore

@@ -0,0 +1 @@
+.git

Dockerfile

@@ -1,11 +1,17 @@
-FROM python:3.7-slim
+FROM python:3-alpine
+
+LABEL maintainer='<author>'
+LABEL version='0.0.0-dev.0-build.0'
+
 ADD . /code
 WORKDIR /code
 RUN \
-  groupadd -r webssh && \
+  apk add --no-cache libc-dev libffi-dev gcc && \
-  useradd -r -s /bin/false -g webssh webssh && \
+  pip install -r requirements.txt --no-cache-dir && \
-  chown -R webssh:webssh /code && \
+  apk del gcc libc-dev libffi-dev && \
-  pip install -r requirements.txt
+  addgroup webssh && \
+  adduser -Ss /bin/false -g webssh webssh && \
+  chown -R webssh:webssh /code
 
 EXPOSE 8888/tcp
 USER webssh