Fix some variables.

tasks/cassandra-repo.yml

@@ -14,8 +14,8 @@
         mode: "0755"
     - name: cassandra-repo | Get the signing key for the cassandra.apache.org repository
       ansible.builtin.get_url:
-        url: "{{ cassandra_deb_repo_key_url }}"
-        dest: "{{ cassandra_repo_key }}"
+        url: "{{ cassandra_repo_key_url }}"
+        dest: "{{ cassandra_deb_repo_key }}"
         owner: root
         group: root
         mode: "0644"
@@ -27,7 +27,7 @@
         components:
           - main
         suites: ["{{ cassandra_repository_rel }}"]
-        signed_by: "{{ cassandra_repo_key }}"
+        signed_by: "{{ cassandra_deb_repo_key }}"
         state: present
         enabled: true