refactor: update repo and install packages in one step

tasks/install-packages.yml

 ---
-# Äquivalent von apt-get update
-- name: apt-get update
-  apt:
-    update_cache: "yes"
-
 - name: Install/Update Debian packages
   apt:
     state: present
@@ -21,3 +16,4 @@
       'tar',
       'unzip'
     ]
+    update_cache: "yes"