siso: Disable remote timeout on linux-official bots

Remote linking for official builds takes much longer than usual.
e.g. 30 minutes for components_unittests

"no-remote-timeout" config allows disables remote timeout easily
for the specific builders.

The build speed improves further:
With remote linking, without remote timeout:
52 minutes at compile step
https://ci.chromium.org/ui/p/chromium/builders/try/linux-official/1543/overview

Only with remote linking:
74 minutes at compile step.
https://ci.chromium.org/ui/p/chromium/builders/try/linux-official/1534/overview

Cq-Include-Trybots: luci.chromium.try:linux-official
Bug: 427503493
Change-Id: I4b7bbcc706683ecae2ae756befaf80cf3df00275
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6678433
Auto-Submit: Junji Watanabe <[email protected]>
Reviewed-by: Takuto Ikuta <[email protected]>
Commit-Queue: Junji Watanabe <[email protected]>
Reviewed-by: Fumitoshi Ukai <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1480346}
NOKEYCHECK=True
GitOrigin-RevId: f9ca08523db1ea599ecb4b2ce9ac32d7907cf892

Author: Jwata

config/siso/config.star

@@ -26,6 +26,11 @@ __KNOWN_CONFIG_OPTIONS = [
     # because developers need objects and tests locally for debugging
     # and testing.
     "remote-link",
+
+    # Unset timeout from rules to allow long remote steps.
+    # This is useful when remote actions are expected to take longer than
+    # the configured timeouts. e.g. remote linking for official builds.
+    "no-remote-timeout",
 ]
 
 def __check(ctx):

config/siso/main.star

@@ -10,6 +10,7 @@ load("@builtin//runtime.star", "runtime")
 load("@builtin//struct.star", "module")
 load("./backend_config/backend.star", "backend")
 load("./blink_all.star", "blink_all")
+load("./config.star", "config")
 load("./gn_logs.star", "gn_logs")
 load("./linux.star", chromium_linux = "chromium")
 load("./mac.star", chromium_mac = "chromium")
@@ -28,6 +29,13 @@ def __disable_remote(ctx, step_config):
         rule["remote"] = False
     return step_config
 
+def __unset_timeout(ctx, step_config):
+    if not config.get(ctx, "no-remote-timeout"):
+        return step_config
+    for rule in step_config["rules"]:
+        rule.pop("timeout", None)
+    return step_config
+
 def init(ctx):
     print("runtime: os:%s arch:%s run:%d" % (
         runtime.os,
@@ -80,6 +88,7 @@ def init(ctx):
         rule["remote_command"] = arg0
 
     step_config = __disable_remote(ctx, step_config)
+    step_config = __unset_timeout(ctx, step_config)
 
     filegroups = {}
     filegroups.update(blink_all.filegroups(ctx))