feat: remove dangling or unused images from local storage after build

container/container.go

@@ -35,6 +35,8 @@ var Commands []config.DockerCommand
 
 var UseCache = true
 
+var Prune = true
+
 type Image struct {
 	Name   string
 	Distro distro.Distro
@@ -231,7 +233,16 @@ func (c Container) Build(image string, envs, runs []string) (err error) {
 	return
 }
 
+func (c Container) prune() error {
+	c.Log.Debug().Msg("remove dangling or unused images from local storage")
+	return exec.Command(Runtime, "image", "prune", "-f").Run()
+}
+
 func (c Container) build(imagePath string) (output string, err error) {
+	if Prune {
+		defer c.prune()
+	}
+
 	args := []string{"build"}
 	if !UseCache {
 		args = append(args, "--pull", "--no-cache")

kernel.go

@@ -31,6 +31,7 @@ type KernelCmd struct {
 	Threads    int  `help:"threads for parallel installation" default:"1"`
 	Update     bool `help:"update container"`
 	Max        int  `help:"maximum kernels to download" default:"100500"`
+	NoPrune    bool `help:"do not remove dangling or unused images from local storage after build"`
 
 	ContainerTimeout time.Duration `help:"container timeout"`
 
@@ -157,6 +158,9 @@ func (cmd *KernelCmd) Generate(g *Globals, km config.Target) (err error) {
 	if cmd.Update {
 		container.UseCache = false
 	}
+	if cmd.NoPrune {
+		container.Prune = false
+	}
 
 	cmd.kcfg, err = config.ReadKernelConfig(g.Config.Kernels)
 	if err != nil {
@@ -246,6 +250,13 @@ type KernelListRemoteCmd struct {
 }
 
 func (cmd *KernelListRemoteCmd) Run(kernelCmd *KernelCmd, g *Globals) (err error) {
+	if kernelCmd.Update {
+		container.UseCache = false
+	}
+	if kernelCmd.NoPrune {
+		container.Prune = false
+	}
+
 	distroType, err := distro.NewID(cmd.Distro)
 	if err != nil {
 		return