Use command module instead

ansible/post-deploy.yml

@@ -74,11 +74,9 @@
       become: true
 
     - name: Check if the public key is already in place
-      lineinfile:
-        path: /var/lib/gitea/git/.ssh/authorized_keys
-        regexp: "^{{ git_id_rsa_pub.stdout }}"
-        state: absent
-      check_mode: true
+      command: 'grep -Fxq "{{ git_id_rsa_pub.stdout}}" /var/lib/gitea/git/.ssh/authorized_keys'
+      check_mode: false
+      ignore_errors: true
       changed_when: false
       register: git_id_rsa_pub_check
 
@@ -94,7 +92,7 @@
         backup: true
         marker: "# ansible inserted git <-> gitea public key"
       become: true
-      when: git_id_rsa_pub_check.found
+      when: git_id_rsa_pub_check.rc == 0
 
     - name: Symlink the gitea authorized keys configuration to the host git user
       file: