lifecycle: migrate: ensure template schema exists before migrating (cherry-pick #8952) (#9022)

lifecycle: migrate: ensure template schema exists before migrating (#8952)

Co-authored-by: Marc 'risson' Schmitt <marc.schmitt@risson.space>

lifecycle/system_migrations/template_schema.py

@@ -0,0 +1,12 @@
+from lifecycle.migrate import BaseMigration
+
+
+class Migration(BaseMigration):
+    def needs_migration(self) -> bool:
+        self.cur.execute(
+            "SELECT schema_name FROM information_schema.schemata WHERE schema_name = 'template';"
+        )
+        return not bool(self.cur.rowcount)
+
+    def run(self):
+        self.cur.execute("CREATE SCHEMA IF NOT EXISTS template; COMMIT;")