Introduce beta Docker deployment

[ag-adampike]

This PR introduces a new deployment example using Docker Swarm and addresses the following outstanding issues for our Docker deployment examples:

• implements the Compose Specification

  • resolves #214

• uses swarm mode to help control startup order (SCIM bridge container will FTL and restart until Redis is available), simplify deployment

  • resolves #163
  • resolves #174
  • resolves #213

Additional improvements:

• introduces a health check for Redis
• templates the compose.yaml file to simplify configuration and allow applying from the command line, obviate need to script or manually overwrite any file
• refactors redis.env into a native redis.conf file (see Redis configuration)
• creates Docker secrets and configs for storing credentials and configuration
• removes all unnecessary port mappings
• introduces resources spec to ensure adequate resources on the Docker host

[ag-adampike]

Working on some changes to this deployment:

• default to Docker Swarm
• rework the setup accordingly
  • start with docker swarm init
  • pipe config into stack deploy instead of writing to disk
• rewrite README

[ag-adampike]

@1Password/1password-solutions-rw have at 'er! Please feel free to merge it in my absence if you feel it's ready! 😘

[ag-adampike]

Thanks for the reviews friends! I want to discuss your concerns and consider your suggestions some more when we can chat it out. 😘