feat(nix): add sops-nix to flake inputs

flake.lock

@@ -215,10 +215,31 @@
         "import-tree": "import-tree",
         "make-shell": "make-shell",
         "nixpkgs": "nixpkgs",
+        "sops-nix": "sops-nix",
         "systems": "systems",
         "text": "text"
       }
     },
+    "sops-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1751606940,
+        "narHash": "sha256-KrDPXobG7DFKTOteqdSVeL1bMVitDcy7otpVZWDE6MA=",
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "rev": "3633fc4acf03f43b260244d94c71e9e14a2f6e0d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "type": "github"
+      }
+    },
     "systems": {
       "locked": {
         "lastModified": 1681028828,

flake.nix

@@ -21,6 +21,11 @@
     };
     # impermanence provides a nice abstraction over linking files from /persist
     impermanence.url = "github:nix-community/impermanence";
+    # sops-nix lets us version control secrets like passwords and api keys
+    sops-nix = {
+      url = "github:Mic92/sops-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     # import-tree imports all nix files in a given directory.
     import-tree.url = "github:vic/import-tree";
     # files lets us write text files and automatically add checks for them