Ensure errors.css is interpreted as UTF-8 encoding
What does this MR do and why?
Since
gitlab-foss!19096 (merged),
we've inlined the errors.css by directly including the Sprockets
assets into the HAML. This worked fine as long as the CSS file
remained as a plain ASCII file. However, the switch to the new CSS
pipeline with
!144479 (merged) appears
to have introduced a single UTF-8 character. Since Sprockets loads the
asset via File.binread (https://github.com/rails/sprockets/blob/d1dcf7075c468522e1cb6f93ae547d8d7fdcfbcb/lib/sprockets/asset.rb#L99), the contents of this UTF-8 file is forced as
ASCII-8BIT. When this ASCII-8BIT string is combined with other UTF-8
characters, such as Chinese characters, the encoding fails with a 500
error: incompatible character encodings: ASCII-8BIT and UTF-8 (Encoding::CompatibilityError).
To work around this issue, we force the encoding to UTF-8 to ensure the error page can render.