Add Rails Docker Compose example

[CodySanders]

No description provided.

[townofdon]

the best

[townofdon]

@CodySanders This is awesome! 👏

Kind of a nit thing - for naming consistency could you change docker-compose-rails to example-rails?

[townofdon]

This is great! I had a few suggestions/comments for learning purposes to make this easier to digest for someone completely new to Docker. Thanks for adding this!

[townofdon]

Could you add a link to the rails example to line 4 of the readme? Also could we move the rails example to ./example-rails/?

[townofdon]

Since this is meant to be a tutorial of sorts, would you be up for adding some comments for what the various lines do? I went this direction in the php example - what do you think? I know it's verbose but for someone totally new to Docker, it would be helpful to have a line-by-line explanation.

[townofdon]

Would you be up for adding line-by-line comments/instructions to the docker compose file? I went with this approach here and it seemed to be good for learning purposes. Let me know what you think!

[CodySanders]

@townofdon I think I addressed all of the suggestions but let me know if I missed anything. I think the comments are certainly helpful but it would also be my hope that this project would be a jumping off point for a discussion with someone who is looking to get into Docker and using it in their development process. There are still many small nuances that aren't covered in detail here but I think it could be a good start.

[CodySanders]

Also, if you pull this down and try to run it please let me know if you run into any issues. I think I remembered to include everything needed but there is always the chance that my machine already had a forgotten dependency included that a new machine would not

[townofdon]

@CodySanders Awesome, thanks for adding those comments! I agree that the documentation is needed for understanding the nuances and anyone looking to deep-dive into Docker, but the comments definitely help and especially add context.

I checked out the branch and ran docker-compose up - worked like a charm!

However running the db:create and db:migrate scripts resulted in an err:

I saw that POSTGRES_PASSWORD is in .env-vars, maybe another env var is needed?

[CodySanders]

Hmm, I will take a look at that. If the .env-vars file is being included in those commands correctly (which I believe it should be since it is declared for those services in docker-compose.yml) then it should just work out of the box. I'll let you know what I find out.