Add direnv support

flake.lock

@@ -10,8 +10,9 @@
         "type": "github"
       },
       "original": {
-        "id": "flake-utils",
-        "type": "indirect"
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
       }
     },
     "flake-utils_2": {
@@ -36,16 +37,15 @@
         "pypi-deps-db": "pypi-deps-db"
       },
       "locked": {
-        "lastModified": 1654084003,
-        "narHash": "sha256-j/XrVVistvM+Ua+0tNFvO5z83isL+LBgmBi9XppxuKA=",
+        "lastModified": 1678343959,
+        "narHash": "sha256-LGFLMTf9gEPYzLuny3idKQOGiZFVhmjR2VGvio4chMI=",
         "owner": "DavHau",
         "repo": "mach-nix",
-        "rev": "7e14360bde07dcae32e5e24f366c83272f52923f",
+        "rev": "f60b9833469adb18e57b4c9e8fc4804fce82e3da",
         "type": "github"
       },
       "original": {
         "id": "mach-nix",
-        "ref": "3.5.0",
         "type": "indirect"
       }
     },
@@ -66,16 +66,17 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1678298120,
-        "narHash": "sha256-iaV5xqgn29xy765Js3EoZePQyZIlLZA3pTYtTnKkejg=",
+        "lastModified": 1678519861,
+        "narHash": "sha256-jo1swATOxWxZU5gnuOEnazr5680o97xlkL6qAHv6Hew=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "1e383aada51b416c6c27d4884d2e258df201bc11",
+        "rev": "20e0820a5ff2c3dc76114368a94c9a1c11bb6cdc",
         "type": "github"
       },
       "original": {
-        "id": "nixpkgs",
-        "type": "indirect"
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
       }
     },
     "pypi-deps-db": {