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* Add hint for GNUPGHOME environment variable With #19732, the default location for the `.gnupg` folder has changed. To mitigate this breaking change, users can specify the home directory for gnupg via `$GNUPGHOME` environment variable to keep using their current location. * Update docs/content/doc/advanced/signing.en-us.md Co-authored-by: wxiaoguang <wxiaoguang@gmail.com> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com> Co-authored-by: John Olheiser <john.olheiser@gmail.com> Co-authored-by: zeripath <art27@cantab.net>