[FORGEJO] lifetime 0 converts to infinity

Closes: https://code.forgejo.org/forgejo/act/issues/2
(cherry picked from commit 6dc2a8e888)

pkg/runner/run_context.go

@@ -472,9 +472,13 @@ func (rc *RunContext) startJobContainer() common.Executor {
 			return nil
 		}
 
+		lifetime := fmt.Sprint(rc.Config.ContainerMaxLifetime.Round(time.Second).Seconds())
+		if lifetime == "0" {
+			lifetime = "infinity"
+		}
 		rc.JobContainer = container.NewContainer(&container.NewContainerInput{
 			Cmd:            nil,
-			Entrypoint:     []string{"/bin/sleep", fmt.Sprint(rc.Config.ContainerMaxLifetime.Round(time.Second).Seconds())},
+			Entrypoint:     []string{"/bin/sleep", lifetime},
 			WorkingDir:     ext.ToContainerPath(rc.Config.Workdir),
 			Image:          image,
 			Username:       username,