bazel: add golangci-lint to //:check target (#1494)

Signed-off-by: Paul Meyer <49727155+katexochen@users.noreply.github.com>

bazel/toolchains/BUILD.golangci.bazel

@@ -0,0 +1,8 @@
+genrule(
+    name = "golangci_lint_bin",
+    srcs = ["golangci-lint"],
+    outs = ["golangci_lint_bin_out"],
+    cmd = "cp $< $@",  # Copy the binary to the output directory.
+    executable = True,
+    visibility = ["//visibility:public"],
+)