Auto-label src/ci and .github/workflows with A-CI

And include `.github/workflows` for `T-infra` trigger files.

Author: jieyouxu

triagebot.toml

@@ -471,6 +471,7 @@ trigger_files = [
 
 [autolabel."T-infra"]
 trigger_files = [
+    ".github/workflows",
     "src/ci",
     "src/tools/bump-stage0",
     "src/tools/cargotest",
@@ -598,6 +599,12 @@ trigger_files = [
     "src/tools/clippy",
 ]
 
+[autolabel."A-CI"]
+trigger_files = [
+    ".github/workflows",
+    "src/ci",
+]
+
 # ------------------------------------------------------------------------------
 # Prioritization and team nominations
 # ------------------------------------------------------------------------------