Push Snapshots Through DevOps Pipeline

[MarianRaphael]

Epic

No response

Description

As a: FlowFuse User who works with Snapshots

I want to: have the possibility to push Snapshots through a DevOps Pipeline, "replacing" the current Instance Status method

So that: my Snapshots become the single point of truth for my implementations, making it easier to manage deployments, rollbacks, and configurations.

See also: https://github.com/flowforge/flowforge/issues/2600

Which customers would this be availble to

Licensed Edition (EE)

Acceptance Criteria

• [x] allow users to select Snapshots as the deployable unit in the DevOps pipeline
• [x] the Snapshot should be visible in the new Instance Snapshot Overview page with the same name (or v2, v3 ...)
• [ ] the current target snapshot should be the default snapshot selected

Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate

### Tasks
- [x] Add 'action' field to PipelineStage model (migration etc)
- [x] Allow action to be configured in UI
- [x] Create 'use latest snapshot' action type
- [x] Create 'prompt to select snapshot' action type

[knolleary]

Proposal via a quick mock-up:

• Add an 'action' field to the Pipeline Stage. This lets the user pick what the stage should do when triggered.
• Options:
  • 'Create new snapshot' - existing behaviour
  • 'Use latest instance snapshot' - grabs the most recent snapshot on the instance
  • 'Prompt to select snapshot' - when triggered, show a dialog to pick a snapshot from.