Add dockerfile

Dockerfile.ci

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+FROM alpine:3.19
+
+ENV UID=1337 \
+    GID=1337
+
+RUN apk add --no-cache ffmpeg su-exec ca-certificates bash jq curl yq
+
+ARG EXECUTABLE=./mautrix-imessage
+COPY $EXECUTABLE /usr/bin/mautrix-imessage
+COPY ./example-config.yaml /opt/mautrix-imessage/example-config.yaml
+COPY ./docker-run.sh /docker-run.sh
+VOLUME /data
+
+CMD ["/docker-run.sh"]

docker-run.sh

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+#!/bin/sh
+
+if [[ -z "$GID" ]]; then
+	GID="$UID"
+fi
+
+# Define functions.
+function fixperms {
+	chown -R $UID:$GID /data
+
+	# /opt/mautrix-imessage is read-only, so disable file logging if it's pointing there.
+	if [[ "$(yq e '.logging.writers[1].filename' /data/config.yaml)" == "./logs/mautrix-imessage.log" ]]; then
+		yq -I4 e -i 'del(.logging.writers[1])' /data/config.yaml
+	fi
+}
+
+if [[ ! -f /data/config.yaml ]]; then
+	cp /opt/mautrix-imessage/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."
+	exit
+fi
+
+if [[ ! -f /data/registration.yaml ]]; then
+	/usr/bin/mautrix-imessage -g -c /data/config.yaml -r /data/registration.yaml || exit $?
+	echo "Didn't find a registration file."
+	echo "Generated one for you."
+	echo "See https://docs.mau.fi/bridges/general/registering-appservices.html on how to use it."
+	exit
+fi
+
+cd /data
+fixperms
+exec su-exec $UID:$GID /usr/bin/mautrix-imessage