make fenix overridable

flake.lock

@@ -2,18 +2,15 @@
   "nodes": {
     "fenix": {
       "inputs": {
-        "nixpkgs": [
-          "naersk",
-          "nixpkgs"
-        ],
+        "nixpkgs": "nixpkgs",
         "rust-analyzer-src": "rust-analyzer-src"
       },
       "locked": {
-        "lastModified": 1752475459,
-        "narHash": "sha256-z6QEu4ZFuHiqdOPbYss4/Q8B0BFhacR8ts6jO/F/aOU=",
+        "lastModified": 1766990808,
+        "narHash": "sha256-6RfhhB6fzxY0p6eE6UhBXoWSaEAcjCgDG9UaQ6ge1tQ=",
         "owner": "nix-community",
         "repo": "fenix",
-        "rev": "bf0d6f70f4c9a9cf8845f992105652173f4b617f",
+        "rev": "dfa623c0a6682e6bd4269cc6192f965beb69aa03",
         "type": "github"
       },
       "original": {
@@ -24,7 +21,9 @@
     },
     "naersk": {
       "inputs": {
-        "fenix": "fenix",
+        "fenix": [
+          "fenix"
+        ],
         "nixpkgs": [
           "nixpkgs"
         ]
@@ -44,6 +43,22 @@
       }
     },
     "nixpkgs": {
+      "locked": {
+        "lastModified": 1766902085,
+        "narHash": "sha256-coBu0ONtFzlwwVBzmjacUQwj3G+lybcZ1oeNSQkgC0M=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "c0b0e0fddf73fd517c3471e546c0df87a42d53f4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
       "locked": {
         "lastModified": 1766870016,
         "narHash": "sha256-fHmxAesa6XNqnIkcS6+nIHuEmgd/iZSP/VXxweiEuQw=",
@@ -61,18 +76,19 @@
     },
     "root": {
       "inputs": {
+        "fenix": "fenix",
         "naersk": "naersk",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs_2"
       }
     },
     "rust-analyzer-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1752428706,
-        "narHash": "sha256-EJcdxw3aXfP8Ex1Nm3s0awyH9egQvB2Gu+QEnJn2Sfg=",
+        "lastModified": 1766928643,
+        "narHash": "sha256-gq96i+4i2QEK94stPLzMeDdpKPOTOvw4Zicy+qLe7p8=",
         "owner": "rust-lang",
         "repo": "rust-analyzer",
-        "rev": "591e3b7624be97e4443ea7b5542c191311aa141d",
+        "rev": "be6975f8f90d33a3b205265a0a858ee29fabae13",
         "type": "github"
       },
       "original": {