[FIX] saas: merge database creation job, modules installing job and p…

…ost init job into one queue job chain

This will escape situations, where modules installing job will start running when database is not created yet

saas/models/saas_template.py

@@ -10,6 +10,7 @@
 from odoo.tools.safe_eval import test_python_expr
 from odoo.addons.http_routing.models.ir_http import slugify
 from odoo.exceptions import ValidationError, UserError
+from odoo.addons.queue_job.delay import group
 
 _logger = logging.getLogger(__name__)
 
@@ -221,13 +222,18 @@ def create_db(self, key_values=None, db_name=None, with_delay=True, draft_build_
 
         self.env['saas.log'].log_db_creating(build, self.operator_db_id)
         if with_delay:
-            build.with_delay().create_db(
-                self.operator_db_name,
-                self.template_id.template_demo,
+            job_create = build.with_delay().create_db(
+                self.operator_db_name, self.template_id.template_demo,
+            )
+            job_install_modules = group(job_create).on_done(
+                build.with_delay().action_install_missing_mandatory_modules()
             )
-            build.with_delay().action_install_missing_mandatory_modules()
 
-            self.operator_id.with_delay().build_post_init(build, self.template_id.build_post_init, key_values)
+            group(job_install_modules).on_done(
+                self.operator_id.with_delay().build_post_init(
+                    build, self.template_id.build_post_init, key_values
+                )
+            )
         else:
             build.create_db(
                 self.operator_db_name,