build: specify docker in packer file

Refs #74016

Change-Id: I6081a44c31c71f7afcfa9fad8cc863e441302bb6

.packer.yml

 win32:
-    type: win32
+    type: docker
     exe_commands:
         - echo "Building Daemon"
         - git clone https://gerrit-ring.savoirfairelinux.com/ring-daemon ring-daemon