>From the pass(1) man page section on environment variables:
PASSWORD_STORE_SIGNING_KEY
If this environment variable is set, then all .gpg-id
files and non-system extension files must be signed
using a detached signature using the GPG key specified by
the full 40 character upper-case fingerprint in
this variable. If multiple fingerprints are specified,
each separated by a whitespace character, then
signatures must match at least one. The init command
will keep signatures of .gpg-id files up to date.
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