Talvez o compartilhamento de todo o arquivo / diretório de configuração esteja causando problemas. Outro método pode funcionar melhor.
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Talvez um "esquema de chaveiro compartilhado" seja melhor, veja
man gpg
para algumas dessas opções possivelmente úteis:--keyring file Add file to the current list of keyrings. If file begins with a tilde and a slash, these are replaced by the $HOME direc‐ tory. If the filename does not contain a slash, it is assumed to be in the GnuPG home directory ("~/.gnupg" if --homedir or $GNUPGHOME is not used). Note that this adds a keyring to the current list. If the intent is to use the specified keyring alone, use --keyring along with --no-default-keyring. --secret-keyring file Same as --keyring but for the secret keyrings. --primary-keyring file Designate file as the primary public keyring. This means that newly imported keys (via --import or keyserver --recv-from) will go to this keyring. --no-default-keyring Do not add the default keyrings to the list of keyrings. Note that GnuPG will not operate without any keyrings, so if you use this option and do not provide alternate keyrings via --keyring or --secret-keyring, then GnuPG will still use the default public or secret keyrings.
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Uma possível opção usando subchaves diferentes