Make Actions tasks/jobs timeouts configurable by the user (#27400)

With this PR we added the possibility to configure the Actions timeouts
values for killing tasks/jobs.
Particularly this enhancement is closely related to the `act_runner`
configuration reported below:
```
# The timeout for a job to be finished.
# Please note that the Gitea instance also has a timeout (3h by default) for the job.
# So the job could be stopped by the Gitea instance if it's timeout is shorter than this.
timeout: 3h
```

---

Setting the corresponding key in the INI configuration file, it is
possible to let jobs run for more than 3 hours.

Signed-off-by: Francesco Antognazza <francesco.antognazza@gmail.com>

modules/setting/actions.go

@@ -6,6 +6,7 @@ package setting
 import (
 	"fmt"
 	"strings"
+	"time"
 
 	"code.gitea.io/gitea/modules/log"
 )
@@ -18,6 +19,9 @@ var (
 		ArtifactRetentionDays int64    `ini:"ARTIFACT_RETENTION_DAYS"`
 		Enabled               bool
 		DefaultActionsURL     defaultActionsURL `ini:"DEFAULT_ACTIONS_URL"`
+		ZombieTaskTimeout     time.Duration     `ini:"ZOMBIE_TASK_TIMEOUT"`
+		EndlessTaskTimeout    time.Duration     `ini:"ENDLESS_TASK_TIMEOUT"`
+		AbandonedJobTimeout   time.Duration     `ini:"ABANDONED_JOB_TIMEOUT"`
 	}{
 		Enabled:           true,
 		DefaultActionsURL: defaultActionsURLGitHub,
@@ -82,5 +86,9 @@ func loadActionsFrom(rootCfg ConfigProvider) error {
 		Actions.ArtifactRetentionDays = 90
 	}
 
+	Actions.ZombieTaskTimeout = sec.Key("ZOMBIE_TASK_TIMEOUT").MustDuration(10 * time.Minute)
+	Actions.EndlessTaskTimeout = sec.Key("ENDLESS_TASK_TIMEOUT").MustDuration(3 * time.Hour)
+	Actions.AbandonedJobTimeout = sec.Key("ABANDONED_JOB_TIMEOUT").MustDuration(24 * time.Hour)
+
 	return err
 }