Have you had a look at pass¹? It's a bash script that uses gnupg to encrypt secrets as gpg-encrypted plain text files. It has a very nice feature that allows you to specify a list of keys for all secrets in a specific directory (using a .gpg-id file).

Once set up, accessing the secrets is a matter of using the pass command line tool:

    pass edit some/secret
    # Copy the first line of a secret; by convention 
    # this is meant for a password:
    pass -c some/secret
    # Show the whole secret file:
    pass some/secret

    # Combined with git:
    pass git pull
    # Generate a 24-character random password:
    pass generate some/othersecret 24
    pass git push

We use pass to maintain a set of shared secrets with a small team. The (encrypted) files are pushed to private git repository (pass supports this out of the box).

1: https://www.passwordstore.org/