secrets: use homeage to manage secrets for home-manager

Instead of using agenix for all the secrets, I can use homeage for
secrets that are related to my user sessions.

Secrets by default will be store under `~/.secrets'. They are encrypted
using `age' and to decrypt them, a key is expected to be located under
`~/.age/key.txt'.

The last place where I was using `pass' (and so GPG too) was for the
secrets for `mbsync': this change adds a secret for fastmail to the
repository and update `mbsync' configuration to use it.

1 files changed, 5 insertions, 0 deletions

diff --git a/flake.nix b/flake.nix
index d82a782..f08ceb7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -33,6 +33,11 @@
       };
     };
 
+    homeage = {
+      url = "github:jordanisaacs/homeage";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
     rust = {
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";