Allow age decryption directly from environment variable #946
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One of the things we noticed when using age for encryption/decryption is that the current sops implementation requires us to first store the private key on disk before we can decrypt secrets. Unfortunately with modern file systems and on SSDs we cannot ensure that the secret key data is fully removed if it was ever on disk.
This pull request adds some code that allows specifying the contents of the age keyfile as an environment variable, thus preventing secret keys from ever having to be stored on disk.