Enable nix development environment

[billgeo]

Enabler

So that we can easily manage packages and simplify the development, we want to use nix tools to create and manage development environments

Acceptance Criteria

• ...
• ...

Additional context

Tasks

• ...
• ...

Definition of Ready

• This story is ready to work on
  • Negotiable (team can decide how to design and implement)
  • Valuable (from a user perspective)
  • Estimate value applied (agreed by team)
  • Small (so as to fit within an iteration)
  • Testable (in principle, even if there isn't a test for it yet)
  • Environments are ready to meet definition of done
  • Resources required to implement will be ready
  • Everyone understands and agrees with the tasks to complete the story
  • Release value (e.g. Iteration 3) applied
  • Sprint value (e.g. Aug 1 - Aug 15) applied

Definition of Done

• This story is done:
  • Acceptance criteria completed
  • Automated tests are passing
  • Code is peer reviewed and pushed to master
  • Deployed successfully to test environment
  • Checked against CODING guidelines
  • Relevant new tasks are added to backlog and communicated to the team
  • Important decisions recorded in the issue ticket
  • Readme/Changelog/Diagrams are updated
  • Product Owner has approved acceptance criteria as complete
  • Meets non-functional requirements:
    • Scalability (data): Can scale to 300TB of data and 100,000,000 files and ability to
      increase 10% every year
    • Scability (users): Can scale to 100 concurrent users
    • Cost: Data can be stored at < 0.5 NZD per GB per year
    • Performance: A large dataset (500 GB and 50,000 files - e.g. Akl aerial imagery) can be
      validated, imported and stored within 24 hours
    • Accessibility: Can be used from LINZ networks and the public internet
    • Availability: System available 24 hours a day and 7 days a week, this does not include
      maintenance windows < 4 hours and does not include operational support
    • Recoverability: RPO of fully imported datasets < 4 hours, RTO of a single 3 TB dataset <
      12 hours

[billgeo]

Remaining to do: split node.js changes to another issue.

[billgeo]

And approve PR etc