feat(dagger): expose --mark-latest flag on attestation init

Forwards the new CLI flag added in #3151 through the Dagger module so
callers can explicitly mark (or skip marking) a project version as latest
when initializing an attestation.

Signed-off-by: Javier Rodriguez <javier@chainloop.dev>

Author: javirln

extras/dagger/main.go

@@ -156,6 +156,10 @@ func (m *Chainloop) Init(
 	// mark the version as release
 	// +optional
 	release bool,
+	// Explicitly mark the project version as latest (use =false to skip promotion).
+	// When unset, the server decides automatically (defaults to latest for new versions).
+	// +optional
+	markLatest *bool,
 	// Github event file for PR detection (when running in Github Actions)
 	// +optional
 	githubEventFile *dagger.File,
@@ -283,6 +287,10 @@ func (m *Chainloop) Init(
 		)
 	}
 
+	if markLatest != nil {
+		args = append(args, fmt.Sprintf("--mark-latest=%t", *markLatest))
+	}
+
 	info, err := att.
 		Container(0).
 		WithExec(args, execOpts).