Fix#36234
## Bug
Logs show `PrepareRunAndInsert: InsertRun: Error 1213: Deadlock found`,
which `handleWorkflows` silently swallows via `log.Error + continue`, so
the triggered run is dropped.
## Root cause
The path `UpdateRun -> UpdateRepoRunsNumbers` runs the following SQL
inside every status-changing transaction:
```sql
UPDATE repository
SET num_action_runs = (SELECT count(*) FROM action_run WHERE repo_id = N),
num_closed_action_runs = (SELECT count(*) FROM action_run WHERE repo_id = N AND status IN (...))
WHERE id = N;
```
On any DB that treats subqueries inside an UPDATE as locking reads, this
statement takes locks in two steps:
1. The outer UPDATE acquires an X lock on `repository[id=N]`
2. The embedded SELECT subqueries are evaluated as locking reads, taking
S locks on every `action_run` row matching `repo_id = N`
Two such concurrent transactions form a cycle via `repository[N]`:
| Tx | Holds | Wants | Blocked by |
|---|---|---|---|
| A: `PrepareRunAndInsert` (push trigger) | X on inserted `action_run`
row R_A; X on `repository[N]` (outer UPDATE already through step 1) | S
on `action_run` rows for repo N (subquery, step 2) | B's X lock on R_B |
| B: `UpdateTaskByState` (runner callback) | X on `action_run` row R_B
(from `UpdateRun`) | X on `repository[N]` (outer UPDATE, step 1) | A's X
lock on `repository[N]` |
| **Cycle** | A waits for R_B; B waits for `repository[N]` | | deadlock
error -> `handleWorkflows` swallows -> run lost |
PostgreSQL's MVCC reads do not take these locks and SQLite serializes
writers, so the symptom only surfaces on MySQL/MSSQL.
## Fix
Split `UpdateRepoRunsNumbers` into small SQLs to avoid locking reads and
move it out of DB transactions.
---------
Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Nicolas <bircni@icloud.com>
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