add tests for ubuntu + task: apt update

roles/grafana_alloy/molecule/default/molecule.yml

@@ -14,6 +14,15 @@ platforms:
       - /sys/fs/cgroup:/sys/fs/cgroup:rw
     cgroupns_mode: host
     privileged: true
+  
+  - name: ubuntu
+    image: geerlingguy/docker-${MOLECULE_DISTRO:-ubuntu2404}-ansible:latest
+    pre_build_image: true
+    command: ${MOLECULE_DOCKER_COMMAND:-""}
+    volumes:
+      - /sys/fs/cgroup:/sys/fs/cgroup:rw
+    cgroupns_mode: host
+    privileged: true
 
 provisioner:
   name: ansible

roles/grafana_alloy/tasks/install.yml

@@ -37,6 +37,11 @@
         fail_msg: "alloy version {{ grafana_alloy_version }} is not installed or not working correctly"
 
   rescue:
+    - name: "Install | Update apt cache on Debian"
+      ansible.builtin.apt:
+        update_cache: true
+      when: ansible_facts["os_family"] == "Debian"
+
     - name: "Install | Ensure unzip is present"
       ansible.builtin.package:
         name: "unzip"