[feature] Switch docker to alpine linux, use tini

Author: subdavis

Dockerfile

@@ -1,12 +1,14 @@
-FROM python:slim
+FROM python:alpine
 
 # Copy only setup.py to utilize build cache
 WORKDIR /home
 COPY setup.py README.md ./
-RUN pip3 install .
+RUN apk add --no-cache gcc tini libc-dev \
+  && pip3 install . \
+  && apk del gcc libc-dev
 
 # Bring over the code and reinstall
 COPY . .
 RUN pip3 install --no-deps .
 
-ENTRYPOINT ["kobodl"]
+ENTRYPOINT ["/sbin/tini", "--", "kobodl"]