It's not the actual contents of the secret key, just the ID. $ENV{SECRET_KEY} is the 8 hex digits of your secret key ID. eg:
$ export SECRET_KEY=0xDEADBEEF GPG_PP='Correct Horse Battery Staple' T +O_MAIL='foo@example.com'
🦛
In reply to Re^7: Unable to get any decrypted output from $gpg->verify
by hippo
in thread Unable to get any decrypted output from $gpg->verify
by xuo
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