fix: declare the dependency on the collection community.general

On Archlinux ansible.builtin.package resolves to the module pacman, which is shipped by community.general and not by
ansible-core. Without the collection the role fails with "Could not find a matching action for the pacman package
manager", which surfaced in the molecule scenario as soon as only the explicitly declared collections were installed.

Co-authored-by: Copilot <copilot@github.com>

README.md

@@ -6,7 +6,8 @@ trust store.
 
 ## Requirements
 
-The role relies on the modules of the collection `community.crypto`.
+The role relies on the modules of the collection `community.crypto`. On Archlinux the collection `community.general`
+is additionally required, because it provides the `pacman` module.
 
 ```bash
 ansible-galaxy collection install -r requirements.yaml

molecule/default/collections.yml

@@ -3,3 +3,4 @@
 collections:
 - name: community.crypto
 - name: community.docker
+- name: community.general

requirements.yaml

@@ -3,3 +3,4 @@
 collections:
 - name: community.crypto
 - name: community.docker
+- name: community.general