Declare External Network in Compose

[pavelbrm]

Summary

This PR allows the dev and web containers communicate with other services via an external network. No changes to the existing flows.

Type of Change

• Product feature
• Bug fix
• Performance improvement
• Refactor
• Other

Tested Environments

• Development
• Staging
• Production

Before submitting this PR:

• Does your code build cleanly without any errors or warnings?
• Have you used auto closing keywords?
• Have you added tests for new functionality?
• Have validated query efficiency for new database queries?
• Have documented new functionality in README or in comments?
• Have you squashed all intermediate commits?
• Is there a clear title that explains what the PR does?
• Have you used intuitive function, variable and other naming?
• Have you requested security / privacy review if needed
• Have you performed a self review of this PR?

Manual Test Plan: