Get last image id from docker output

plugins/providers/docker/driver.rb

@@ -24,13 +24,13 @@ module VagrantPlugins
         args << dir
         opts = {with_stderr: true}
         result = execute('docker', 'build', *args, opts, &block)
-        matches = result.match(/Successfully built (?<id>.+)$/i)
+        matches = result.scan(/Successfully built (?<id>.+)$/i).last
         if !matches
           # Check for the new output format 'writing image sha256...'
           # In this case, docker builtkit is enabled. Its format is different
           # from standard docker
           @logger.warn("Could not determine docker container ID. Scanning for buildkit output instead")
-          matches = result.match(/writing image .+:(?<id>[0-9a-z]+) done/i)
+          matches = result.scan(/writing image .+:(?<id>[0-9a-z]+) done/i).last
           if !matches
             # This will cause a stack trace in Vagrant, but it is a bug
             # if this happens anyways.
@@ -39,7 +39,7 @@ module VagrantPlugins
         end
 
         # Return the matched group `id`
-        matches[:id]
+        matches[0]
       end
 
       def create(params, **opts, &block)