Always clone fresh plugin for step we're testing

Author: mokagio

.buildkite/pipeline.yml

@@ -126,4 +126,6 @@ steps:
       - label: ":sleuth_or_spy: Lint Localized Strings Format"
         command: .buildkite/commands/lint-localized-strings-format.sh
         plugins: *common_plugins
-        env: *common_env
+        env:
+          <<: *common_env
+          BUILDKITE_PLUGINS_ALWAYS_CLONE_FRESH: true