## Main Changes
1. change the dockerfile, adding the shell to wait for storage backend and use a docker-entrypoint.sh to manage the starting process.
2. delete a deprecated class in gremlin-console.sh (reference: [doc of ScriptExecutor](https://tinkerpop.apache.org/javadocs/3.2.3/full/org/apache/tinkerpop/gremlin/groovy/jsr223/ScriptExecutor.html))
3. add a healthy check in docker-compose
4. add an example folder where we can put all the template docker-compose.yml here
5. add `*swagger-ui*` in gitignore, which appears after you compile the source code locally.
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Co-authored-by: imbajin <jin@apache.org>
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