Set up Localstack for local emulation in development

[dcollie2]

Description

Many of our core deliverables involve accessing Azure file storage. It would be helpful for us to have a way to do this in our individual local development environments.

Tasks

• Add local stack
• Add docker compose for development environment
• Update readme so developers have enough information to set this up and use it

[hernanvicente]

Hello @dcollie2, after trying different approaches, I think it won't be possible to emulate Azure Files on local development because it requires a paid license.

Microsoft has a solution for the same scenario (emulation for local development) named Azurite.

However, this open-source project implements all the Azure storage services except Azure Files. Here is the link to the GitHub Issue with the exact requirement, but the development team doesn't prioritize this feature.

For now, the easiest or fastest way to continue is to create or share limited access for development.

Here are my questions:

• Do we have access to create this kind of access, or are these the credentials you sent me already?
• There are other cloud services to emulate locally, E.g., AWS S3. Can I include this in this PR? LocalStack for AWS is free, and we can set it up already. This way, ActiveStorage's provider will be identical for development and production.