Call intermittent checker

Part of servo/servo#12629

buildbot/master/files/config/master.cfg

@@ -93,9 +93,11 @@ c['schedulers'].append(schedulers.ForceScheduler(
         "linux-dev-yaml",
         "linux-nightly",
         "linux-rel",
+        "linux-rel-intermittent",
         "mac-dev-unit",
         "mac-nightly",
         "mac-rel-css",
+        "mac-rel-intermittent",
         "mac-rel-wpt",
         "windows-dev",
         "windows-nightly",
@@ -107,7 +109,9 @@ c['schedulers'].append(schedulers.Nightly(
     builderNames=[
         "android-nightly",
         "linux-nightly",
+        "linux-rel-intermittent",
         "mac-nightly",
+        "mac-rel-intermittent",
         "windows-nightly",
     ],
     hour=1,
@@ -167,9 +171,12 @@ c['builders'] = [
     DynamicServoBuilder("linux-dev", LINUX_SLAVES, envs.build_linux),
     DynamicServoBuilder("linux-nightly", LINUX_SLAVES, envs.build_linux),
     DynamicServoBuilder("linux-rel", LINUX_SLAVES, envs.build_linux),
+    DynamicServoBuilder("linux-rel-intermittent", LINUX_SLAVES,
+                        envs.build_linux),
     DynamicServoBuilder("mac-dev-unit", MAC_SLAVES, envs.build_mac),
     DynamicServoBuilder("mac-nightly", MAC_SLAVES, envs.build_mac),
     DynamicServoBuilder("mac-rel-css", MAC_SLAVES, envs.build_mac),
+    DynamicServoBuilder("mac-rel-intermittent", MAC_SLAVES, envs.build_mac),
     DynamicServoBuilder("mac-rel-wpt", MAC_SLAVES, envs.build_mac),
     DynamicServoBuilder("windows-dev", WINDOWS_SLAVES, envs.build_windows),
     DynamicServoBuilder("windows-nightly", WINDOWS_SLAVES, envs.build_windows),

buildbot/master/files/config/steps.yml

@@ -27,6 +27,14 @@ mac-nightly:
   - ./mach package --release
   - ./etc/ci/upload_nightly.sh mac
 
+linux-rel-intermittent:
+  - ./mach build --release
+  - ./etc/ci/check_intermittents.sh --log-raw intermittents.log
+
+mac-rel-intermittent:
+  - ./mach build --release
+  - ./etc/ci/check_intermittents.sh --log-raw intermittents.log
+
 linux-dev:
   - ./mach test-tidy --no-progress --all
   - ./mach test-tidy --no-progress --self-test