feat(configuration): add Debian/Ubuntu repository and apt configuration

roles/configuration/tasks/repositories.yml

@@ -0,0 +1,25 @@
+---
+- name: Write final sources.list
+  vars:
+    _debian_release_map:
+      "10": buster
+      "11": bullseye
+      "12": bookworm
+      "13": trixie
+      unstable: sid
+    _ubuntu_release_map:
+      ubuntu: questing
+      ubuntu-lts: noble
+  ansible.builtin.template:
+    src: "{{ os | replace('-lts', '') }}.sources.list.j2"
+    dest: /mnt/etc/apt/sources.list
+    mode: "0644"
+
+- name: Ensure apt performance configuration persists
+  ansible.builtin.copy:
+    dest: /mnt/etc/apt/apt.conf.d/99performance
+    content: |
+      Acquire::Retries "3";
+      Acquire::http::Pipeline-Depth "10";
+      APT::Install-Recommends "false";
+    mode: "0644"