contrib: Catch signals to delete tmp folder in local-analyze-images

[Quentin-M]

• Create the temporary folder earlier in the app (main instead of save)
• Catch SIGINT/SIGKILL signals to delete the temporary folder and exit

[jzelinskie]

this case is going to error, but exit 0

[jzelinskie]

Let's wrap main so that we can return custom errors and get custom exit codes.

package main

import "fmt"
import "os"

func doTheStuff() int {
    defer fmt.Println("!")

    return 3
}

func main() {
    os.Exit(doTheStuff())
}

Let's also block on a select at the bottom of the function waiting for analyzelocalimage or the interrupt

[Quentin-M]

Meh ^

[jzelinskie]

LGTM