Basic docker support

Dockerfile

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+FROM python:alpine
+
+RUN apk add --no-cache gettext
+
+WORKDIR /app/
+COPY . .
+
+RUN cd locales && find . -maxdepth 2 -type d -name 'LC_MESSAGES' -exec ash -c 'msgfmt {}/unobot.po -o {}/unobot.mo' \;
+
+RUN pip install -r requirements.txt
+
+ENTRYPOINT python3 ./bot.py