feature: added support for substituting secrets into files #290
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A while ago I started using agenix with an additional feature to allow the substitution of decrypted secrets into files and it was recently suggested that I look into upstreaming this feature.
The core functionality (that is added to both the nixos and home-manager modules) is implemented via the
age.secrets.secret-name.substitutionsoption. When given a list of file paths (as strings), any instance of@secret-name@in these files will be substituted with the corresponding secret. If the file is managed viahome.filein home-manager, I recommend settingforce = truefor this file to avoid collision warnings.I haven't implemented any additional tests for this feature yet but can look into it if needed.