Try setting scope for privileged docker

tools/ci/tc/decision.py

diff --git a/tools/ci/tc/decision.py b/tools/ci/tc/decision.py
index 915b80d..a585b2f 100644
--- a/tools/ci/tc/decision.py
+++ b/tools/ci/tc/decision.py
@@ -249,6 +249,7 @@
         "provisionerId": task["provisionerId"],
         "schedulerId": task["schedulerId"],
         "workerType": task["workerType"],
+        "scopes": task.get("scopes", []),
         "metadata": {
             "name": task["name"],
             "description": task.get("description", ""),

tools/ci/tc/tasks/test.yml

diff --git a/tools/ci/tc/tasks/test.yml b/tools/ci/tc/tasks/test.yml
index f6c3678..d2090c4 100644
--- a/tools/ci/tc/tasks/test.yml
+++ b/tools/ci/tc/tasks/test.yml
@@ -110,6 +110,8 @@
 
   browser-firefox_android:
     privileged: true
+    scopes:
+      - "docker-worker:capability:privileged:proj-wpt/ci"
 
   tox-python3_7:
     env: