suppressing canonical-repository warning (#1447)

Co-authored-by: Tim Malmström <oreflow@google.com>

buildifier/internal/factory.bzl

diff --git a/buildifier/internal/factory.bzl b/buildifier/internal/factory.bzl
index 0ad56ff..88b8132 100644
--- a/buildifier/internal/factory.bzl
+++ b/buildifier/internal/factory.bzl
@@ -168,6 +168,7 @@
             fail("Cannot use 'no_sandbox' without a 'workspace'")
         workspace = ctx.file.workspace.path
 
+    # buildifier: disable=canonical-repository
     substitutions = {
         "@@ARGS@@": shell.array_literal(args),
         "@@BUILDIFIER_SHORT_PATH@@": shell.quote(ctx.executable.buildifier.short_path),