⚙️ Enhancements to final images building

This commit is multi-fold and impacts several areas:

- Don't re-generate final artifact locally if already present while
building with `requires_final_images`.
- Expose to CLI a way to build final images without pushing them.
- The packages listed with `requires_final_images` now are evaluated by
  the solver so the full deptree is took into account

Fixes: https://github.com/mudler/luet/issues/294

pkg/compiler/types/options/compiler_options.go

@@ -49,6 +49,9 @@ type Compiler struct {
 	// Tells wether to push final container images after building
 	PushFinalImages      bool
 	PushFinalImagesForce bool
+
+	GenerateFinalImages bool
+
 	// Image repository to push to
 	PushFinalImagesRepository string
 
@@ -99,6 +102,11 @@ func WithFinalRepository(r string) func(cfg *Compiler) error {
 	}
 }
 
+func EnableGenerateFinalImages(cfg *Compiler) error {
+	cfg.GenerateFinalImages = true
+	return nil
+}
+
 func EnablePushFinalImages(cfg *Compiler) error {
 	cfg.PushFinalImages = true
 	return nil