perf: speed up job setup, action preparation and the cache server (#1327)

- Look up containers by name instead of listing all of them
- On Linux, cache the docker proxy discovery instead of starting a probe container per job
- Download a job's actions concurrently and share identical fetches between concurrent jobs
- Cache `runner.arch` per run and poll service health every 250ms
- Cache server: queue on an in-process lock instead of polling the database file lock, upload S3 objects up to 64MiB in one request and larger ones in 4 concurrent parts

| `exec`, median of 5 | Before | After |
|---|---:|---:|
| 1 step | 1.70s | 0.87s |
| 10 steps | 2.84s | 1.97s |
| Service + step | 3.78s | 2.18s |
| checkout + Node action | 3.64s | 2.52s |

Reviewed-on: https://gitea.com/gitea/runner/pulls/1327
Reviewed-by: Zettat123 <[email protected]>

act/runner/expression.go

@@ -49,7 +49,9 @@ func (rc *RunContext) NewExpressionEvaluatorWithEnv(ctx context.Context, env map
 				result := model.WorkflowCallResult{
 					Outputs: map[string]string{},
 				}
+				unlock := lockJob(job)
 				maps.Copy(result.Outputs, job.Outputs)
+				unlock()
 				workflowCallResult[jobName] = &result
 			}
 		}