Finish inital schema migration script

example-project/docker/datadog-agent/Dockerfile

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+FROM datadog/agent:latest
+
+LABEL maintainer="lee@geeksinthewoods.com"
+
+#COPY target/go_expvar.conf.yaml /etc/datadog-agent/conf.d/go_expvar.d/conf.yaml
+COPY target/custom-init.sh /custom-init.sh
+
+ARG service
+ENV SERVICE_NAME $service
+
+ARG env="dev"
+ENV ENV $env
+
+ENV DD_TAGS="source:docker service:${service} service_name:${service} cluster:NA env:${ENV}"
+
+CMD ["/custom-init.sh"]

example-project/docker/datadog-agent/custom-init.sh

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+#!/usr/bin/env bash
+
+configFile="/etc/datadog-agent/conf.d/go_expvar.d/conf.yaml"
+
+echo -e "init_config:\n\ninstances:\n  - expvar_url: http://localhost:80/debug/vars" > $configFile
+
+if [[ "${DD_TAGS}" != "" ]]; then
+    echo "    tags:" >> $configFile
+    for t in ${DD_TAGS}; do
+        echo "      - \"${t}\"" >> $configFile
+    done
+fi
+
+cat $configFile
+
+/init