[CLI] Add a destroy app command

[mirkoCrobu]

Motivation

closes #105

We could add a new app destroycommand (or a similar name) for stopping and removing all the data of an app.
In particular, we should do a docker-compose down and remove the .cache.

We should also consider adding a destroyed (or a better name) that is the default state of an app if it has not been run yet.
With this additional state, we would then be able to always return a state when listing the apps (right now apps and examples that have not been run, will show up as with no state).

Change description

Additional Notes

Reviewer checklist

• PR addresses a single concern.
• PR title and description are properly filled.
• Changes will be merged in main.
• Changes are covered by tests.
• Logging is meaningful in case of troubleshooting.

[mirkoCrobu]

Add uninitialized status and set status information for app list

[lucarin91]

We should also add an endpoint for doing this (maybe in a subsequent PR)

[mirkoCrobu]

We should also add an endpoint for doing this (maybe in a subsequent PR)

[API] Add a destroy app command

[lucarin91]

Are you sure that this is a valid app? Maybe we still need to return nil nil here

[mirkoCrobu]

It is possible to have a valid app without containers. But, to be sure we also need to perform an app validation within the filesystem or something like that. So for now, it is better to keep the nil nil and maybe handle this use case in a different PR if we decide it is needed

[mirkoCrobu]

So I guess it would be better to move the whole part about introducing a new 'uninitialized' app status(valid app with no containers) to a dedicated PR, and focus this one just on implementing the destroy command.
What do you think?

[lucarin91]

No, I would keep it, maybe we can add this check to be sure we always return the status of an existing app

diff --git a/internal/orchestrator/helpers.go b/internal/orchestrator/helpers.go
index 3c1564e..b762418 100644
--- a/internal/orchestrator/helpers.go
+++ b/internal/orchestrator/helpers.go
@@ -150,10 +150,14 @@ func getAppStatusByPath(
                return nil, fmt.Errorf("failed to list containers: %w", err)
        }
        if len(containers) == 0 {
-               return &AppStatusInfo{
-                       AppPath: paths.New(pathLabel),
-                       Status:  StatusUninitialized,
-               }, nil
+               path := paths.New(pathLabel)
+               if _, err := app.Load(path); err == nil {
+                       return &AppStatusInfo{
+                               AppPath: path,
+                               Status:  StatusUninitialized,
+                       }, nil
+               }
+               return nil, nil
        }

        app := parseAppStatus(containers)