DEV: Fix race conditions due to directory removal for uploads spec.

spec/components/file_store/base_store_spec.rb

@@ -47,8 +47,6 @@ RSpec.describe FileStore::BaseStore do
 
   describe '#download' do
     before do
-      `rm -rf #{FileStore::BaseStore::CACHE_DIR}`
-
       SiteSetting.enable_s3_uploads = true
       SiteSetting.s3_upload_bucket = "s3-upload-bucket"
       SiteSetting.s3_access_key_id = "some key"

spec/fabricators/upload_fabricator.rb

@@ -2,7 +2,7 @@
 
 Fabricator(:upload) do
   user
-  sha1 { sequence(:sha1) { |n| Digest::SHA1.hexdigest(n.to_s) } }
+  sha1 { sequence(:sha1) { |n| Digest::SHA1.hexdigest("#{n}#{Process.pid}") } }
   original_filename "logo.png"
   filesize 1234
   width 100