Fix unsafe container cleanup in delete_image

Previously, delete_image stopped ALL containers on the system before
removing the test image. This could interrupt unrelated containers.

Now only stops and removes containers created from the specific test
image being cleaned up.

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

Author: chorrell

spec/spec_helper.rb

@@ -15,9 +15,12 @@ def create_image(version)
 
   def delete_image
     puts "Deleting image..."
-    # Stop all containers so we can remove the image
-    for container in Docker::Container.all(:all => true)
-      container.stop
+    # Stop and remove only containers created from this image
+    Docker::Container.all(:all => true).each do |container|
+      if container.info['Image'] == @image.id || container.info['ImageID'] == @image.id
+        container.stop
+        container.delete(:force => true)
+      end
     end
 
     @image.remove(:force => true)