build/fietsje: move to toolbase

This removes some of the bash magic copied over from Gazelle, and
instead uses toolbase to achieve the same effect.

Change-Id: I6ea3bfda68092c00ea58883bb9b1f7c0779a97e6
Reviewed-on: https://review.monogon.dev/c/monogon/+/330
Reviewed-by: Mateusz Zalega <mateusz@monogon.tech>
diff --git a/build/fietsje/BUILD.bazel b/build/fietsje/BUILD.bazel
index 77f1bbd..733a832 100644
--- a/build/fietsje/BUILD.bazel
+++ b/build/fietsje/BUILD.bazel
@@ -18,6 +18,8 @@
     visibility = ["//visibility:private"],
     deps = [
         "//build/fietsje/proto:go_default_library",
+        "//build/toolbase:go_default_library",
+        "//build/toolbase/gotoolchain:go_default_library",
         "@bazel_gazelle//label:go_default_library",
         "@com_github_golang_protobuf//proto:go_default_library",
         "@org_golang_x_mod//modfile:go_default_library",