Integrate selected builds with candidate workflows

internal/candidate/check.go

@@ -30,6 +30,7 @@ type Request struct {
 	Product       string
 	Version       string
 	Validate      func(context.Context, Candidate) error
+	AfterValidate func(context.Context, Candidate) error
 	Output        io.Writer
 }
 
@@ -41,6 +42,11 @@ func Check(ctx context.Context, request Request) (Candidate, error) {
 	if err := Validate(ctx, request, captured); err != nil {
 		return Candidate{}, err
 	}
+	if request.AfterValidate != nil {
+		if err := request.AfterValidate(ctx, captured); err != nil {
+			return Candidate{}, fmt.Errorf("after candidate validation: %w", err)
+		}
+	}
 	if err := Recheck(ctx, captured, ""); err != nil {
 		return Candidate{}, err
 	}