Change lock type when flyway run

[GregoireW]

Lock type can block "create index concurrently", we can remove the transaction lock here.

[github-actions]

DBLinter Report:

Issues found:

- ⚠️ B003 2 table without index on foreign key exceed the warning threshold: 10%.
+ ↪️ create a index on foreign key or change warning/error threshold.

- ⚠️ T004 unindexed fk postgres.public.employee.
+ ↪️ create index on employee(employee_role_id).

- ⚠️ T004 unindexed fk postgres.public.project.
+ ↪️ create index on project(client_id).