pass: docker login does not work after rotating gpg key

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Repro steps:

• Store a login cred:

aws ecr get-login-password --region us-east-1 | docker login --username AWS --password-stdin 123456789.dkr.ecr.us-east-1.amazonaws.com

• Rotate your gpg key
• Re-store the login cred with the same command as step 1

Expected result:
The creds are stored successfully

Actual result:
The old credentials can't be decrypted, so the credential helper fails with gpg: decryption failed: No secret key

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Note that there are other issues with this error message - e.g., #118

but it wasn't clear to me if they're the same issue

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i actually think this is kind of an interop issue between docker-credential-helpers and DD, where DD is assuming that if the credential has a decryption error, it means the credential store is corrupted somehow, and so prevents the Store()