Merge branch 'alpine-image' into 'staging-unstable'

Rewrote the staging image Dockerfile to use an Alpine-based image instead of the Debian image.

See merge request s3lph/matemat!15

.gitlab-ci.yml

@@ -38,3 +38,4 @@ staging:
     url: https://matemat.kernelpanic.lol/
   only:
   - staging-unstable
+  - alpine-image

Dockerfile

@@ -1,17 +1,9 @@
 
-FROM debian:buster
+FROM python:3.6-alpine
 
-RUN useradd -d /home/matemat -m matemat
-RUN mkdir -p /var/matemat/db && chown matemat:matemat -R /var/matemat/db
-RUN mkdir -p /var/matemat/upload && chown matemat:matemat -R /var/matemat/upload
-RUN apt-get update -qy
-RUN apt-get install -y --no-install-recommends python3-dev python3-pip python3-coverage python3-setuptools build-essential
-RUN pip3 install wheel pycodestyle mypy
-ADD . /home/matemat
-RUN chown matemat:matemat -R /home/matemat
-RUN pip3 install -r /home/matemat/requirements.txt
+RUN mkdir -p /var/matemat/db /var/matemat/upload
+ADD . /
+RUN pip3 install -r /requirements.txt
 
-WORKDIR /home/matemat
-# USER matemat
-CMD python3 -m matemat
-EXPOSE 8080/tcp
+EXPOSE 80/tcp
+CMD [ "/usr/local/bin/python3", "-m", "matemat" ]