add flakes and direnv files

.envrc

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+use flake

flake.lock

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+{
+  "nodes": {
+    "flake-schemas": {
+      "locked": {
+        "lastModified": 1721999734,
+        "narHash": "sha256-G5CxYeJVm4lcEtaO87LKzOsVnWeTcHGKbKxNamNWgOw=",
+        "rev": "0a5c42297d870156d9c57d8f99e476b738dcd982",
+        "revCount": 75,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/DeterminateSystems/flake-schemas/0.1.5/0190ef2f-61e0-794b-ba14-e82f225e55e6/source.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://flakehub.com/f/DeterminateSystems/flake-schemas/%2A.tar.gz"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1722372011,
+        "narHash": "sha256-B2xRiC3NEJy/82ugtareBkRqEkPGpMyjaLxaR8LBxNs=",
+        "rev": "cf05eeada35e122770c5c14add958790fcfcbef5",
+        "revCount": 633614,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2405.633614%2Brev-cf05eeada35e122770c5c14add958790fcfcbef5/01910e77-e048-77f4-b2d4-a69cacb697db/source.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/%2A.tar.gz"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-schemas": "flake-schemas",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1722548948,
+        "narHash": "sha256-ddR/6wbOzRXijcOAEgeaIlbskky51eJdZhYPwoErs3s=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "0b973d3e54e497e518515c05a6e99ec6c03be2ce",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+# This flake was initially generated by fh, the CLI for FlakeHub (version 0.1.10)
+{
+  # A helpful description of your flake
+  description = "A Gitea command line application";
+
+  # Flake inputs
+  inputs = {
+    flake-schemas.url = "https://flakehub.com/f/DeterminateSystems/flake-schemas/*.tar.gz";
+
+    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/*.tar.gz";
+
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  # Flake outputs that other flakes can use
+  outputs = { self, flake-schemas, nixpkgs, rust-overlay }:
+    let
+      # Nixpkgs overlays
+      overlays = [
+        rust-overlay.overlays.default
+        (final: prev: {
+          rustToolchain = final.rust-bin.stable.latest.default.override { extensions = [ "rust-src"]; };
+        })
+      ];
+
+      # Helpers for producing system-specific outputs
+      supportedSystems = [ "x86_64-linux" "aarch64-darwin" "x86_64-darwin" "aarch64-linux" ];
+      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+        pkgs = import nixpkgs { inherit overlays system; };
+      });
+    in {
+      # Schemas tell Nix about the structure of your flake's outputs
+      schemas = flake-schemas.schemas;
+
+      # Development environments
+      devShells = forEachSupportedSystem ({ pkgs }: {
+        default = pkgs.mkShell {
+          # Pinned packages available in the environment
+          packages = with pkgs; [
+            rustToolchain
+            rust-analyzer
+            curl
+            git
+            jq
+            wget
+            nixpkgs-fmt
+            openssl
+          ];
+
+          # Environment variables
+          env = {
+            RUST_BACKTRACE = "1";
+            RUST_SRC_PATH = "${pkgs.rustToolchain}/lib/rustlib/src/rust/library";
+          };
+        };
+      });
+    };
+}

rust-analyzer.json

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+{
+  "rust-analyzer": {
+    "files": {
+      "excludeDirs": [".direnv"]
+    }
+  }
+}