feat(3p/agenix): update to 2022-05-16 and add to niv

The new version brings the new secretsDir setting which means we no
longer have to hardcode /run/agenix everywhere.

Change-Id: I4b579d7233d315a780d7671869d5d06722d769fa
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5646
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: sterni <sternenseemann@systemli.org>

third_party/agenix/default.nix

@@ -1,12 +1,8 @@
-{ pkgs, ... }:
+{ pkgs, depot, ... }:
 
 let
-  src = pkgs.fetchFromGitHub {
-    owner = "ryantm";
-    repo = "agenix";
-    rev = "52ea2f8c3231cc2b5302fa28c63588aacb77ea29";
-    sha256 = "1sqgbriwmvxcmqp0zbk7873psk9g60a53fgrr9p0jafki5zzgvdx";
-  };
+  src = depot.third_party.sources.agenix;
+
   agenix = import src {
     inherit pkgs;
   };

third_party/sources/sources.json

@@ -1,4 +1,16 @@
 {
+    "agenix": {
+        "branch": "main",
+        "description": "age-encrypted secrets for NixOS",
+        "homepage": "https://matrix.to/#/#agenix:nixos.org",
+        "owner": "ryantm",
+        "repo": "agenix",
+        "rev": "7e5e58b98c3dcbf497543ff6f22591552ebfe65b",
+        "sha256": "1cfdd2ja56g8clllygf91il7dignr90ij1bl29g3kl7dl977dhl4",
+        "type": "tarball",
+        "url": "https://github.com/ryantm/agenix/archive/7e5e58b98c3dcbf497543ff6f22591552ebfe65b.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
     "emacs-overlay": {
         "branch": "master",
         "description": "Bleeding edge emacs overlay [maintainer=@adisbladis] ",