autolabel PRs that change etc tests as F-explicit_tail_calls

Author: WaffleLapkin

triagebot.toml

@@ -287,6 +287,11 @@ trigger_files = [
     "compiler/rustc_codegen_llvm/src/llvm/enzyme_ffi.rs",
 ]
 
+[autolabel."F-explicit_tail_calls"]
+trigger_files = [
+    "tests/ui/explicit-tail-calls",
+]
+
 [autolabel."T-rustdoc-frontend"]
 trigger_labels = [
     "A-rustdoc-search",