Fix regression to backup task on first time setup.

tasks/build.yml

@@ -33,11 +33,16 @@
   when: git_repository.changed
   changed_when: git_repository.changed
 
+- name: Check if strfry data path exists
+  ansible.builtin.stat:
+    path: "{{ strfry_data_path }}"
+  register: strfry_data_path_stat
+
 - name: Backup existing strfry-db
   ansible.builtin.shell:
     cmd: strfry export > backup.jsonl
-    chdir: "{{ strfry_binary_path }}"
+    chdir: "{{ strfry_data_path }}"
   become: yes
   become_user: "{{ strfry_system_user }}"
-  when: git_repository.changed
+  when: git_repository.changed and strfry_data_path_stat.stat.exists
   changed_when: git_repository.changed