Add trains-agent dockerfile

docker/services/Dockerfile

@@ -0,0 +1,16 @@
+# syntax = docker/dockerfile
+FROM ubuntu:18.04
+
+WORKDIR /usr/agent
+
+COPY . /usr/agent
+
+RUN apt-get update
+RUN apt-get dist-upgrade -y
+RUN apt-get install -y curl python3-pip git
+RUN curl -sSL https://get.docker.com/ | sh
+RUN python3 -m pip install -U pip
+RUN python3 -m pip install trains-agent
+RUN python3 -m pip install -U "cryptography>=2.9"
+
+ENTRYPOINT ["/usr/agent/entrypoint.sh"]

docker/services/entrypoint.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+if [ -z "$TRAINS_FILES_HOST" ]; then
+    TRAINS_HOST_IP=${TRAINS_HOST_IP:-$(curl -s https://ifconfig.me/ip)}
+fi
+
+TRAINS_FILES_HOST=${TRAINS_FILES_HOST:-"http://$TRAINS_HOST_IP:8081"}
+TRAINS_WEB_HOST=${TRAINS_WEB_HOST:-"http://$TRAINS_HOST_IP:8080"}
+TRAINS_API_HOST=${TRAINS_API_HOST:-"http://$TRAINS_HOST_IP:8008"}
+
+echo $TRAINS_FILES_HOST $TRAINS_WEB_HOST $TRAINS_API_HOST 1>&2
+
+python3 -m pip install -q -U "trains-agent${TRAINS_AGENT_UPDATE_VERSION}"
+trains-agent daemon --services-mode --queue services --create-queue --docker $TRAINS_AGENT_DEFAULT_BASE_DOCKER --cpu-only $TRAINS_AGENT_EXTRA_ARGS