fix: force git cloning after changes have occurred

tasks/compile_callas_binaries.yml

@@ -24,9 +24,11 @@
     repo: "git@git.slub-dresden.de:slub-digitalpreservation/pdfa_webservice.git"
     dest: "/opt/pdfa_webservice/"
     depth: 1
+    force: true
     key_file: "/tmp/id_ed25519_deploykey"
     ssh_opts: "-o StrictHostKeyChecking=accept-new"
 #   delegate_to: 127.0.0.1
+  changed_when: false    # This cannot be idempotent, because later tasks change the repo content.
 
 # - name: copy PDF/A-Webservice Git repo to managed host
 #   ansible.builtin.copy: