Add untested dockerfile

Dockerfile

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+FROM docker.io/alpine:3.8
+
+ENV UID=1338 \
+    GID=1338
+
+COPY . /opt/maubot
+WORKDIR /opt/maubot
+RUN apk add --no-cache \
+      python3-dev \
+      build-base \
+      py3-aiohttp \
+      py3-sqlalchemy \
+      py3-attrs \
+      ca-certificates \
+      su-exec \
+ && pip3 install -r requirements.txt -r optional-requirements.txt
+
+VOLUME /data
+
+CMD ["/opt/mautrix-telegram/docker-run.sh"]

docker-run.sh

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+#!/bin/sh
+
+# Define functions.
+function fixperms {
+	chown -R $UID:$GID /data /opt/maubot
+}
+
+cd /opt/maubot
+
+# Replace database path in config.
+sed -i "s#sqlite:///maubot.db#sqlite:////data/maubot.db#" /data/config.yaml
+sed -i "s#- ./plugins#- /data/plugins#" /data/config.yaml
+
+# Check that database is in the right state
+alembic -x config=/data/config.yaml upgrade head
+
+if [ ! -f /data/config.yaml ]; then
+	cp example-config.yaml /data/config.yaml
+	echo "Didn't find a config file."
+	echo "Copied default config file to /data/config.yaml"
+	echo "Modify that config file to your liking."
+	echo "Start the container again after that to generate the registration file."
+	fixperms
+	exit
+fi
+
+fixperms
+exec su-exec $UID:$GID python3 -m maubot -c /data/config.yaml