[buildbot] phase1: run ForceBuilder on local worker

[LEDE Commits]

ynezz pushed a commit to buildbot.git, branch master:
https://git.openwrt.org/d69e0a7fa12353cbdc51a827ee13f94d41f3cec6

commit d69e0a7fa12353cbdc51a827ee13f94d41f3cec6
Author: Thibaut VARÈNE <hacks at slashdirt.org>
AuthorDate: Wed Oct 26 22:53:12 2022 +0200

    phase1: run ForceBuilder on local worker
    
    There is no reason to send this over the network to some remote worker,
    incurring latency for a purely housekeeping task that should be done on
    the buildmaster host.
    
    Signed-off-by: Thibaut VARÈNE <hacks at slashdirt.org>
---
 phase1/master.cfg | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/phase1/master.cfg b/phase1/master.cfg
index 46a9f70..2b1b72a 100644
--- a/phase1/master.cfg
+++ b/phase1/master.cfg
@@ -38,6 +38,7 @@ from buildbot.steps.transfer import FileDownload
 from buildbot.steps.transfer import FileUpload
 from buildbot.steps.transfer import StringDownload
 from buildbot.worker import Worker
+from buildbot.worker.local import LocalWorker
 
 
 if not os.path.exists("twistd.pid"):
@@ -550,11 +551,14 @@ workerNames = [ ]
 for worker in c['workers']:
 	workerNames.append(worker.workername)
 
+# add a single LocalWorker to handle the forcebuild builder
+c['workers'].append(LocalWorker("__local_force_build", max_builds=1))
+
 force_factory = BuildFactory()
 
 c['builders'].append(BuilderConfig(
 	name        = "00_force_build",
-	workernames = workerNames,
+	workername  = "__local_force_build",
 	factory     = force_factory))
 
 for target in targets: