[fan-out integration] new SDK

[migmartri]

UPDATE

This effort has evolved into creating a custom SDK for extensions that can be found here https://github.com/chainloop-dev/chainloop/tree/main/app/controlplane/extensions

NOTE: We should make sure that whatever design we make here meets also this #28 other effort.

Currently, adding a third party integration requires changes in many places in the control-plane codebase as described here #37 (comment). In short it requires changes is pretty much every layer of the application, a) api proto changes, b) biz/use-cases changes and of course c) actual integration code.

c) is the only part that's clearly defined with interfaces

chainloop/app/controlplane/internal/integrations/integration.go

Lines 20 to 29 in e770fae

	type Checker interface {
	// Validate that the integration can be registered for future calls
	Validate(ctx context.Context) error
	}
	type Doer interface {
	Do(ctx context.Context) error
	// Validate that the integration can be performed with the parameters provided
	Validate(ctx context.Context) error
	}

The other two changes are currently custom and per-integration.

The goal of this effort is to design an architecture where adding a new integration just requires such custom code to implement some interfaces, custom code that should probably live in https://github.com/chainloop-dev/chainloop/tree/e770faeeed854cfcff45a06100f9a2eef57d779a/app/controlplane/internal/integrations

Some goals

• These new interfaces should cover the "registration" and "attachment" use cases
• We should aim to no code changes required for a new attestation in the biz, service or API layer

Tasks

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[migmartri]

A WIP code for the dispatcher codo can be found here https://github.com/migmartri/chainloop/pull/1/files

[migmartri]

Our latest release contains all the sdk changes and new plugins https://github.com/chainloop-dev/chainloop/releases/tag/v0.11.1