Fix checksum comparison

lib/dockerhub.nu

@@ -10,6 +10,8 @@ export def get_image_digest [image: string] {
     | from json
     | get config 
     | get digest
+    | split row ":"
+    | get 1
   )
 }
 

podman-update-check

@@ -30,10 +30,10 @@ export def needs_update [] {
   let name_parts = ( $data.Name | split row "/" --number 2 ) 
   let host = ( $name_parts | first )
   let image = ( $name_parts | last | split row ":" | get 0 )
-  let digest = $data.Digest
+  let digest = $data.Id
 
-  if $host == "docker.io/" {
-    ( dockerhub get_image_digest $image ) == digest
+  if $host == "docker.io" {
+    ( dockerhub get_image_digest $image ) != $digest
   } else {
     false
   }