Dokerized tweet collector and tweet store

[cegme]

To start fetching tweets on the UW server we need to dockerize the process. That is, we need a PostgreSQL docker setup and also another container to pull the tweets. Below are the items that need to be developed to get this system running.

• [ ] Allow the PostgreSQL docker server to use external volumes that are persistent.
• [ ] Create a backup system for the tweet database.
• [ ] Implement public networking between PostgreSQL and any other web host or docker
• [ ] Upload the customized PostgreSQL Docker service to docker hub.
• [x] Create docker service for tweet collector.
• [ ] Upload docker server for tweet collector to docker hub.
• [ ] Update passwords and security

[cegme]

We can't have the PostgreSQL system directly on the host because linking a volume will erase the the contents. To persist across failed and closed docker containers we can create frequent backups to the /opt/docker directory https://wiki.postgresql.org/wiki/Automated_Backup_on_Linux. We can add recovery from the backup to the database startup script.