nix: initial tooling setup

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Ib47aeafee9474f491cfebddd3fa935826a6a6964

.envrc

@@ -0,0 +1 @@
+use flake

flake.lock

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+{
+  "nodes": {
+    "crane": {
+      "locked": {
+        "lastModified": 1760924934,
+        "narHash": "sha256-tuuqY5aU7cUkR71sO2TraVKK2boYrdW3gCSXUkF4i44=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "c6b4d5308293d0d04fcfeee92705017537cad02f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1761880412,
+        "narHash": "sha256-QoJjGd4NstnyOG4mm4KXF+weBzA2AH/7gn1Pmpfcb0A=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a7fc11be66bdfb5cdde611ee5ce381c183da8386",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "crane": "crane",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    crane.url = "github:ipetkov/crane";
+  };
+
+  outputs = {
+    nixpkgs,
+    crane,
+    ...
+  }: let
+    # FIXME: allow multi-system when I can be arsed to write the abstractions
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+    craneLib = crane.mkLib pkgs;
+    src = craneLib.cleanCargoSource ./.;
+
+    commonArgs = {
+      pname = "feel-ci";
+      inherit src;
+      strictDeps = true;
+    };
+
+    cargoArtifacts = craneLib.buildDepsOnly commonArgs;
+
+    # Build individual workspace members
+    server = craneLib.buildPackage (commonArgs
+      // {
+        inherit cargoArtifacts;
+        pname = "server";
+        cargoExtraArgs = "--package server";
+      });
+
+    evaluator = craneLib.buildPackage (commonArgs
+      // {
+        inherit cargoArtifacts;
+        pname = "evaluator";
+        cargoExtraArgs = "--package evaluator";
+      });
+
+    queue-runner = craneLib.buildPackage (commonArgs
+      // {
+        inherit cargoArtifacts;
+        pname = "queue-runner";
+        cargoExtraArgs = "--package queue-runner";
+      });
+
+    common = craneLib.buildPackage (commonArgs
+      // {
+        inherit cargoArtifacts;
+        pname = "common";
+        cargoExtraArgs = "--package common";
+      });
+  in {
+    packages.${system} = {
+      inherit server evaluator queue-runner common;
+    };
+
+    devShells.${system}.default = craneLib.devShell {
+      name = "fc";
+      inputsFrom = [server];
+      packages = with pkgs; [
+        rust-analyzer
+        postgresql
+        pkg-config
+        openssl
+      ];
+    };
+  };
+}