Решено Missing `secret_key_base` for production environment

$ RAILS_ENV=production rake secret

$ bin/rails credentials:edit
Adding config/master.key to store the encryption key: 58808d993e89239990a7053314a39ba9

Save this in a password manager your team can access.

If you lose the key, no one, including you, can access anything encrypted with it.

      create  config/master.key

Ignoring config/master.key so it won't end up in Git history:

      append  .gitignore

No $VISUAL or $EDITOR to open file in. Assign one like this:

VISUAL="mate --wait" bin/rails credentials:edit

For editors that fork and exit immediately, it's important to pass a wait flag;
otherwise, the file will be saved immediately with no chance to edit.