Add apt preferences file for dell repo

Deny all packages from dell repo that exist elsewhere

Fixes #95

roles/ubuntu_base/tasks/custom-apt-repos.yml

@@ -8,8 +8,16 @@
   apt_repository:
     repo: "deb https://linux.dell.com/repo/community/openmanage/10101/focal focal main"
     state: "present"
+
+- name: "restrict dell apt repo"
+  copy:
+    dest: "/etc/apt/preferences.d/dell"
+    content: |
+      Explanation: Deny all packages from this repo that exist elsewhere
+      Package: *
+      Pin: origin "linux.dell.com"
+      Pin-Priority: 400
   
 - name: update apt cache
   apt: 
     update_cache: yes
-