feat: set up agenix secrets management

flake.lock

@@ -1,5 +1,25 @@
 {
   "nodes": {
+    "agenix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1648942457,
+        "narHash": "sha256-i29Z1t3sVfCNfpp+KAfeExvpqHQSbLO1KWylTtfradU=",
+        "owner": "ryantm",
+        "repo": "agenix",
+        "rev": "0d5e59ed645e4c7b60174bc6f6aac6a203dc0b01",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ryantm",
+        "repo": "agenix",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "locked": {
         "lastModified": 1649676176,
@@ -22,11 +42,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1651598446,
-        "narHash": "sha256-UykdAyAcf2zFW5Wbv3uXDhMg9Fd+zarrRQxfMnR2BAs=",
+        "lastModified": 1651616957,
+        "narHash": "sha256-L1Chwdxsa3VusVDgViNk7q4EIC/h8Ndw7YYKVDDRkyU=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "ac722cddf44276d2b11d797b2ace273d0b674000",
+        "rev": "c13ffa3ed42a653c058d78771f4ff0ef8798e7fd",
         "type": "github"
       },
       "original": {
@@ -86,11 +106,11 @@
     },
     "nur": {
       "locked": {
-        "lastModified": 1651598969,
-        "narHash": "sha256-TYGiklLzXEtObbEfXeI3/SZYnDNztMcxaV5BGU9Z0+c=",
+        "lastModified": 1651617509,
+        "narHash": "sha256-lEUvJ4sHYGi6AcwDCNEPnTP8+N0+eOg/KXL1QBtDMyk=",
         "owner": "nix-community",
         "repo": "NUR",
-        "rev": "04bdecaeaaabafd5343b41e4b57c7434ec571730",
+        "rev": "116deaecbe3ba60c6a645220ce7be96e4ff4f56f",
         "type": "github"
       },
       "original": {
@@ -141,6 +161,7 @@
     },
     "root": {
       "inputs": {
+        "agenix": "agenix",
         "flake-utils": "flake-utils",
         "home-manager": "home-manager",
         "nixos-hardware": "nixos-hardware",