Merge branch 'dev' into 'master'

switch base image to python:alpine

See merge request aaron-riedel/shbot!13

Dockerfile

@@ -1,11 +1,12 @@
-FROM python:slim
+FROM python:alpine
 
 WORKDIR ./
 ARG PUID=1000
+ENV GROUP dockergroup
 ENV USER docker
 ENV HOMEDIR "/home/${USER}"
 
-RUN useradd -u "${PUID}" -m "${USER}"
+RUN addgroup -S "${GROUP}" && adduser -S "${USER}" -G "${GROUP}"
 USER ${USER}
 WORKDIR ${HOMEDIR}
 COPY . .