fix(nix-secrets): use simplified signing key setup

flake.lock

@@ -121,11 +121,11 @@
       },
       "locked": {
         "dir": "pkgs/firefox-addons",
-        "lastModified": 1775966594,
-        "narHash": "sha256-pnRtaqTr7ut8dz8b04OWAanUM4tGhDUJz8SWmeTRp7U=",
+        "lastModified": 1776225785,
+        "narHash": "sha256-yrRZkEEtTwJcIXzxL/nCFpyGsz7VmkOJSoyx/AX6Ri8=",
         "owner": "rycee",
         "repo": "nur-expressions",
-        "rev": "000d1d2322d28fa0a51b8db9f85a227aa5413b52",
+        "rev": "c09a1a34c147aefac0ff10017644ca17a3230e8c",
         "type": "gitlab"
       },
       "original": {
@@ -342,11 +342,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1775983377,
-        "narHash": "sha256-ZeRjipGQnVtQ/6batI+yVOrL853FZsL0m9A63OaSfgM=",
+        "lastModified": 1776184304,
+        "narHash": "sha256-No6QGBmIv5ChiwKCcbkxjdEQ/RO2ZS1gD7SFy6EZ7rc=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "e0ca734ffc85d25297715e98010b93303fa165c4",
+        "rev": "3c7524c68348ef79ce48308e0978611a050089b2",
         "type": "github"
       },
       "original": {
@@ -398,10 +398,10 @@
     "nix-secrets": {
       "flake": false,
       "locked": {
-        "lastModified": 1776003473,
-        "narHash": "sha256-v87721Nfc5qnevsgGkaAO+MpeJdfgPtBpazs6N5dUiI=",
+        "lastModified": 1776276250,
+        "narHash": "sha256-j7Bs6ZHkOrCM4GKVmeOJDTYgxWPOys9saCkiQ+BExPU=",
         "ref": "main",
-        "rev": "d95fb37764e5033ad2cdf543f7d8acccb36146c8",
+        "rev": "d27bff628f13bedfaad5011437e00ec62feceb56",
         "shallow": true,
         "type": "git",
         "url": "ssh://git@github.com/hektor/nix-secrets"
@@ -665,11 +665,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1775971308,
-        "narHash": "sha256-VKp9bhVSm0bT6JWctFy06ocqxGGnWHi1NfoE90IgIcY=",
+        "lastModified": 1776119890,
+        "narHash": "sha256-Zm6bxLNnEOYuS/SzrAGsYuXSwk3cbkRQZY0fJnk8a5M=",
         "owner": "Mic92",
         "repo": "sops-nix",
-        "rev": "31ac5fe5d015f76b54058c69fcaebb66a55871a4",
+        "rev": "d4971dd58c6627bfee52a1ad4237637c0a2fb0cd",
         "type": "github"
       },
       "original": {
@@ -714,11 +714,11 @@
         "tinted-zed": "tinted-zed"
       },
       "locked": {
-        "lastModified": 1775936757,
-        "narHash": "sha256-KJO/7qoxJ+hlsb3WlFSl6IGrExBIf1GvKdrhOlnGdKY=",
+        "lastModified": 1776170745,
+        "narHash": "sha256-Tl1aZVP5EIlT+k0+iAKH018GLHJpLz3hhJ0LNQOWxCc=",
         "owner": "danth",
         "repo": "stylix",
-        "rev": "d3e447786b74d62c75f665e17cb3e681c66e90c7",
+        "rev": "e3861617645a43c9bbefde1aa6ac54dd0a44bfa9",
         "type": "github"
       },
       "original": {