tests(packer): cleanup cloud init files.

tests/packer/init/debian-server.user-data.yml

@@ -35,7 +35,7 @@ runcmd:
   - apt-get install -y -t bookworm-backports golang-go
 
 write_files:
-
+  # Add backports repository
   - path: /etc/apt/sources.list
     append: true
     content: deb http://deb.debian.org/debian bookworm-backports main contrib non-free
@@ -48,8 +48,8 @@ write_files:
 
   # Network configuration
   - path: /etc/systemd/network/20-wired.network
-    owner: 'root:root'
-    permissions: '0644'
+    owner: "root:root"
+    permissions: "0644"
     content: |
       [Match]
       Name=en*