More CI (#3)

- ci only: use a separate zig cache dir for each run
- use `tools/bazel` everywhere.
- remove arm64 tests. They don't give enough value to be worth the
  brittle environment.
- remove windows execution, except for launcher. Ditto. I will probably
  bring them back.

bin/buildifier

@@ -1,4 +1,8 @@
 #!/bin/sh
-set -eu
 
-"$(git rev-parse --show-toplevel)/tools/bazel" run @com_github_bazelbuild_buildtools//buildifier -- $@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
+set -xeu
+
+exec "$(git rev-parse --show-toplevel)/tools/bazel" run @com_github_bazelbuild_buildtools//buildifier -- "$@"

bin/mod-tidy

@@ -2,8 +2,11 @@
 
 # Copyright 2023 Uber Technologies, Inc.
 # Licensed under the Apache License, Version 2.0
-set -eu
+set -xeu
 
 cd "$(git rev-parse --show-toplevel)/"
-bazel run @go_sdk//:bin/go -- mod tidy
-exec bazel run //:gazelle-update-repos
+echo "--- go mod tidy"
+tools/bazel run @go_sdk//:bin/go -- mod tidy
+
+echo "--- gazelle-update-repos"
+exec tools/bazel run //:gazelle-update-repos