build: specify docker in packer file

Refs #74016

Change-Id: I6081a44c31c71f7afcfa9fad8cc863e441302bb6
diff --git a/.packer.yml b/.packer.yml
index df42021..e205640 100644
--- a/.packer.yml
+++ b/.packer.yml
@@ -1,5 +1,5 @@
 win32:
-    type: win32
+    type: docker
     exe_commands:
         - echo "Building Daemon"
         - git clone https://gerrit-ring.savoirfairelinux.com/ring-daemon ring-daemon