test(zigux): add lane16 rbtree findAddCached replay runner

zigux/tests/phase1_rbtree_find_add_cached_bench_replay_build.zig

@@ -0,0 +1,38 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const root_module = b.createModule(.{
+        .root_source_file = b.path("phase1_rbtree_find_add_cached_bench_replay.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+    const rbtree_module = b.createModule(.{
+        .root_source_file = b.path("../../tools/lib/rbtree.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    root_module.addImport("rbtree", rbtree_module);
+
+    const tests = b.addTest(.{
+        .root_module = root_module,
+    });
+    const run_tests = b.addRunArtifact(tests);
+
+    const replay_step = b.step(
+        "phase1-rbtree-find-add-cached-bench-replay",
+        "Run the Phase 1 rbtree findAddCached bench replay",
+    );
+    replay_step.dependOn(&run_tests.step);
+
+    const test_step = b.step(
+        "test",
+        "Run the Phase 1 rbtree findAddCached bench replay",
+    );
+    test_step.dependOn(&run_tests.step);
+
+    b.default_step.dependOn(test_step);
+}