add devshell to flake

flake.lock

@@ -1,10 +1,29 @@
 {
   "nodes": {
-    "emacs-overlay": {
+    "devshell": {
       "inputs": {
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       },
+      "locked": {
+        "lastModified": 1658746384,
+        "narHash": "sha256-CCJcoMOcXyZFrV1ag4XMTpAPjLWb4Anbv+ktXFI1ry0=",
+        "owner": "numtide",
+        "repo": "devshell",
+        "rev": "0ffc7937bb5e8141af03d462b468bd071eb18e1b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "devshell",
+        "type": "github"
+      }
+    },
+    "emacs-overlay": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": "nixpkgs_2"
+      },
       "locked": {
         "lastModified": 1658833746,
         "narHash": "sha256-bm/FXx7lH8xaM1excP4SLexVBdaTKE5tZS8PyuibnsA=",
@@ -20,6 +39,21 @@
       }
     },
     "flake-utils": {
+      "locked": {
+        "lastModified": 1642700792,
+        "narHash": "sha256-XqHrk7hFb+zBvRg6Ghl+AZDq03ov6OshJLiSWOoX5es=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "846b2ae0fc4cc943637d3d1def4454213e203cba",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
       "locked": {
         "lastModified": 1656928814,
         "narHash": "sha256-RIFfgBuKz6Hp89yRr7+NR5tzIAbn52h8vT6vXkYjZoM=",
@@ -72,7 +106,7 @@
     },
     "musnix": {
       "inputs": {
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": "nixpkgs_3"
       },
       "locked": {
         "lastModified": 1628019651,
@@ -89,6 +123,22 @@
       }
     },
     "nixpkgs": {
+      "locked": {
+        "lastModified": 1643381941,
+        "narHash": "sha256-pHTwvnN4tTsEKkWlXQ8JMY423epos8wUOhthpwJjtpc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "5efc8ca954272c4376ac929f4c5ffefcc20551d5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
       "locked": {
         "lastModified": 0,
         "narHash": "sha256-mO+23f3SO+fBzEvbxRe6GkSB5Xp43CT2sV8Rs8MYdz8=",
@@ -100,7 +150,7 @@
         "type": "indirect"
       }
     },
-    "nixpkgs_2": {
+    "nixpkgs_3": {
       "locked": {
         "lastModified": 1623743177,
         "narHash": "sha256-57OM8Ya/yGHAHBq/h0I8Ah/HJFmk0VNpEASYxr+BgK8=",
@@ -116,7 +166,7 @@
         "type": "github"
       }
     },
-    "nixpkgs_3": {
+    "nixpkgs_4": {
       "locked": {
         "lastModified": 1658737577,
         "narHash": "sha256-xosJ5nJT9HX+b6UWsSX6R+ap4AdZOCrl/r+IKFp2ASQ=",
@@ -149,11 +199,12 @@
     },
     "root": {
       "inputs": {
+        "devshell": "devshell",
         "emacs-overlay": "emacs-overlay",
         "hardware": "hardware",
         "home-manager": "home-manager",
         "musnix": "musnix",
-        "nixpkgs": "nixpkgs_3",
+        "nixpkgs": "nixpkgs_4",
         "nur": "nur"
       }
     },