remove ssh private key and add it to sops.

flake.lock

@@ -822,7 +822,8 @@
         "nixos-hardware": "nixos-hardware",
         "nixpkgs": "nixpkgs_4",
         "nur-xddxdd": "nur-xddxdd",
-        "oskars-dotfiles": "oskars-dotfiles"
+        "oskars-dotfiles": "oskars-dotfiles",
+        "sops-nix": "sops-nix"
       }
     },
     "rust-overlay": {
@@ -888,6 +889,26 @@
         "type": "github"
       }
     },
+    "sops-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1736203741,
+        "narHash": "sha256-eSjkBwBdQk+TZWFlLbclF2rAh4JxbGg8az4w/Lfe7f4=",
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "rev": "c9c88f08e3ee495e888b8d7c8624a0b2519cb773",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "type": "github"
+      }
+    },
     "systems": {
       "locked": {
         "lastModified": 1681028828,