Add infrastructure and service dependencies map

[Nitemaeric]

Context

Changes proposed in this pull request

Guidance to review

Link to Trello card

Screenshots

architecture-beta
  group app(cloud)[ITT Mentor Services]
  service app_server(server)[Ruby on Rails web server] in app
  service app_worker(server)[GoodJob worker] in app
  service azure_frontdoor(logos:microsoft-azure)[Azure Front Door] in app
  service db(database)[PostgreSQL] in app
  service register_server(internet)[Register trainee teachers API]
  service publish_server(internet)[Publish teacher training courses API]
  service trs_server(internet)[Teaching record system API]
  service gias_data(database)[Get information about schools CSV]
  service browser(material-symbols:computer-outline)[Browser]
  junction external
  azure_frontdoor:R -- L:app_server
  browser:R --> L:azure_frontdoor
  app_worker:L -- R:db
  app_server:R -- L:db
  app_worker:R -- L:external
  app_worker:T -- B:gias_data
  external:R -- L:register_server
  external:T -- B:publish_server
  external:B -- T:trs_server

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[ollietreend]

I'm not 100% sure about the layout of this diagram. Which is tricky, because Mermaid doesn't give us much control over that. I wonder if a more traditional PNG/SVG diagram would give us more control here.

I feel like the junction is a bit clunky – it's not clear what that represents, or if it's just there to control the diagram layout?

A couple of things which stand out:

• Register trainee teachers API – we don't integrate with this API; it shouldn't be on the diagram
• DfE Sign-in – it'd probably be worth including DfE Sign-in as another external service which we depend upon for user authentication