Add zed-editor package and overlay to flake (#16783)

Adds a `zed-editor` package to the flake, along with exported overlay.
Uses [`crane`](https://crane.dev) to avoid issues with updating
git-sourced dependencies' hashes. Crane will also be useful if we want
to export separate packages for `stable`, `preview`, and `nightly` in
the future.

Release Notes:

- Added a default package + overlay to Zed's Nix flake. This is useful
for users wanting to pilot nightly builds of Zed on NixOS.

flake.lock

@@ -1,12 +1,67 @@
 {
   "nodes": {
+    "crane": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1724537630,
+        "narHash": "sha256-gpqINM71zp3kw5XYwUXa84ZtPnCmLLnByuFoYesT1bY=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "3e08f4b1fc9aaede5dd511d8f5f4ef27501e49b0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1724480904,
+        "narHash": "sha256-puBjYiWZMu/VhDk5ZQW88o/IlwsYuoqvCglOESolyBc=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "dba5ef499c684acae11a2661d0ed45017fe75b71",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "revCount": 57,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/edolstra/flake-compat/1.0.1/018afb31-abd1-7bff-a5e4-cff7e18efb7a/source.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://flakehub.com/f/edolstra/flake-compat/1.tar.gz"
+      }
+    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1719690277,
-        "narHash": "sha256-0xSej1g7eP2kaUF+JQp8jdyNmpmCJKRpO12mKl/36Kc=",
+        "lastModified": 1724224976,
+        "narHash": "sha256-Z/ELQhrSd7bMzTO8r7NZgi9g5emh+aRKoCdaAv5fiO0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "2741b4b489b55df32afac57bc4bfd220e8bf617e",
+        "rev": "c374d94f1536013ca8e92341b540eba4c22f9c62",
         "type": "github"
       },
       "original": {
@@ -18,8 +73,28 @@
     },
     "root": {
       "inputs": {
+        "crane": "crane",
+        "fenix": "fenix",
+        "flake-compat": "flake-compat",
         "nixpkgs": "nixpkgs"
       }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1724436261,
+        "narHash": "sha256-N6p1Qd7qgIATJz61JXAqV/rd8umeg0Uj1IawJCTdDlU=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "ab34fdd9f3367d1761991f78e3a7006a4d8d2b34",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
     }
   },
   "root": "root",