DCD-798: name dump as tar file and specify custom format in db_restore to workaround module not supporting custom pg_dump format

roles/restore_backups/tasks/main.yml

@@ -76,7 +76,9 @@
         overwrite: different
         bucket: "{{ atl_backup_manifest.artifacts.sharedHome.location.location | urlsplit('hostname') }}"
         object: "{{ atl_backup_manifest.artifacts.sharedHome.location.location | urlsplit('path') }}"
-        dest: "{{ atl_backup_home_dest }}"
+        # We save the backup as a .tar file so that the postgresql_db module uses pg_restore instead of psql to do restore
+        # This can be removed when ansible 2.10 is released
+        dest: "{{ atl_backup_home_dest }}.tar"
 
     - name: Install distro-specific restore support packages
       include_tasks: "{{ ansible_distribution|lower }}.yml"
@@ -96,7 +98,8 @@
         template: "{{ atl_jdbc_template }}"
         # Depends on fetch_backup roles
         state: restore
-        target: "{{ atl_backup_db_dest }}"
+        target: "{{ atl_backup_db_dest }}.tar"
+        target_opts: "-Fc"
       register: result
       # managed DBs in cloud providers are not allowing full root access to the DB engine, we can safely ignore the COMMENT ON EXTENSION error
       failed_when: