add script to build and push to binary cache

This is even useful for local development, as you can pre-populate the
binary cache before running CI (assuming you have the token). Also, it
being in a script makes it easier to test.

We've added attic as a flake input even though the flake itself doesn't
use it so that we can use `--inputs-from .` in Nix commands to reference
a locked version of attic. This helps with reproducibility and caching,
and to makes it easy to update attic because it's part of the normal
flake lifecycle.

.envrc

@@ -1,3 +1,5 @@
 #!/usr/bin/env bash
 
 use flake
+
+PATH_add bin

flake.lock

@@ -1,6 +1,50 @@
 {
   "nodes": {
+    "attic": {
+      "inputs": {
+        "crane": "crane",
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1705617092,
+        "narHash": "sha256-n9PK4O4X4S1JkwpkMuYm1wHZYJzRqif8g3RuVIPD+rY=",
+        "owner": "zhaofengli",
+        "repo": "attic",
+        "rev": "fbe252a5c21febbe920c025560cbd63b20e24f3b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "zhaofengli",
+        "ref": "main",
+        "repo": "attic",
+        "type": "github"
+      }
+    },
     "crane": {
+      "inputs": {
+        "nixpkgs": [
+          "attic",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1702918879,
+        "narHash": "sha256-tWJqzajIvYcaRWxn+cLUB9L9Pv4dQ3Bfit/YjU5ze3g=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "7195c00c272fdd92fc74e7d5a0a2844b9fadb2fb",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
+    "crane_2": {
       "inputs": {
         "nixpkgs": [
           "nixpkgs"
@@ -41,7 +85,38 @@
         "type": "github"
       }
     },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1673956053,
+        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "flake-utils": {
+      "locked": {
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
       "inputs": {
         "systems": "systems"
       },
@@ -75,6 +150,38 @@
       }
     },
     "nixpkgs": {
+      "locked": {
+        "lastModified": 1702539185,
+        "narHash": "sha256-KnIRG5NMdLIpEkZTnN5zovNYc0hhXjAgv6pfd5Z4c7U=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "aa9d4729cbc99dabacb50e3994dcefb3ea0f7447",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1702780907,
+        "narHash": "sha256-blbrBBXjjZt6OKTcYX1jpe9SRof2P9ZYWPzq22tzXAA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "1e2e384c5b7c50dbf8e9c441a9e58d85f408b01f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
       "locked": {
         "lastModified": 1705496572,
         "narHash": "sha256-rPIe9G5EBLXdBdn9ilGc0nq082lzQd0xGGe092R/5QE=",
@@ -92,11 +199,12 @@
     },
     "root": {
       "inputs": {
-        "crane": "crane",
+        "attic": "attic",
+        "crane": "crane_2",
         "fenix": "fenix",
-        "flake-utils": "flake-utils",
+        "flake-utils": "flake-utils_2",
         "nix-filter": "nix-filter",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs_2"
       }
     },
     "rust-analyzer-src": {

flake.nix

@@ -12,6 +12,7 @@
       url = "github:ipetkov/crane";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    attic.url = "github:zhaofengli/attic?ref=main";
   };
 
   outputs =
@@ -22,6 +23,7 @@
 
     , fenix
     , crane
+    , ...
     }: flake-utils.lib.eachDefaultSystem (system:
     let
       pkgs = nixpkgs.legacyPackages.${system};