hosts/hydra-1: Sign nix cache entries with multiple keys

flake.lock

@@ -79,6 +79,27 @@
       }
     },
     "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": [
+          "harmonia",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1712014858,
+        "narHash": "sha256-sB4SWl2lX95bExY2gMFG5HIzvva5AVMJd4Igm+GpZNw=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "9126214d0a59633752a136528f5f3b9aa8565b7d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "flake-parts_2": {
       "inputs": {
         "nixpkgs-lib": [
           "ssh-to-age",
@@ -117,6 +138,29 @@
         "type": "github"
       }
     },
+    "harmonia": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "treefmt-nix": "treefmt-nix"
+      },
+      "locked": {
+        "lastModified": 1716301230,
+        "narHash": "sha256-olEXRstmP0lf0H11ht6j3co7mNwcDEXTm+eGfwdEJzM=",
+        "owner": "clerie",
+        "repo": "harmonia",
+        "rev": "e99509779ce6d6ed46062ac556b71f6ca1eb59ad",
+        "type": "github"
+      },
+      "original": {
+        "owner": "clerie",
+        "ref": "clerie/multiple-signing-keys",
+        "repo": "harmonia",
+        "type": "github"
+      }
+    },
     "mitel-ommclient2": {
       "inputs": {
         "nixpkgs": [
@@ -244,6 +288,7 @@
         "chaosevents": "chaosevents",
         "fernglas": "fernglas",
         "fieldpoc": "fieldpoc",
+        "harmonia": "harmonia",
         "nixos-exporter": "nixos-exporter",
         "nixos-hardware": "nixos-hardware",
         "nixpkgs": "nixpkgs_3",
@@ -295,7 +340,7 @@
     },
     "ssh-to-age": {
       "inputs": {
-        "flake-parts": "flake-parts",
+        "flake-parts": "flake-parts_2",
         "nixpkgs": [
           "nixpkgs"
         ]
@@ -328,6 +373,27 @@
         "repo": "default",
         "type": "github"
       }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "harmonia",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1711963903,
+        "narHash": "sha256-N3QDhoaX+paWXHbEXZapqd1r95mdshxToGowtjtYkGI=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "49dc4a92b02b8e68798abd99184f228243b6e3ac",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
     }
   },
   "root": "root",