* Recreate a docker dir with all docker files inside and add init.sh
* Add docker/README.md with example docker-compose.xml
* Add mysql vars for mempool-config.json
* Port can be set from env var in docker-compose.xml
* Update docker-compose.xml example to use latest tag
* Remove armv7 architecture from build workflow
* Remove master git-hash file
* Remove useless ':' in sed