Add flake

.envrc

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+use flake

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1746663147,
+        "narHash": "sha256-Ua0drDHawlzNqJnclTJGf87dBmaO/tn7iZ+TCkTRpRc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "dda3dcd3fe03e991015e9a74b22d35950f264a54",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "R development shell";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs =
+    { self, nixpkgs, ... }:
+    let
+      system = "x86_64-linux";
+      pkgs = import nixpkgs {
+        inherit system;
+      };
+      quarto = pkgs.quarto.overrideAttrs (oldAttrs: rec {
+        installPhase = ''
+          runHook preInstall
+
+          mkdir -p $out/bin $out/share
+
+          mv bin/* $out/bin
+          mv share/* $out/share
+
+          runHook postInstall
+        '';
+      });
+    in
+    {
+      devShells.x86_64-linux.default = pkgs.mkShell rec {
+        name = "R_environment";
+        buildInputs = with pkgs; [
+          # Technical dependencies:
+          R
+          python312Packages.radian
+          quarto
+          rPackages.languageserver
+          rPackages.lintr
+          rPackages.styler
+          rPackages.httpgd
+          rPackages.crayon
+          rPackages.cli
+
+          # Actual R packages needed for the project:
+          rPackages.quarto
+          rPackages.tidyverse
+          rPackages.data_table
+          rPackages.anytime
+          rPackages.dbx
+          rPackages.RMySQL
+          rPackages.gamlss
+          rPackages.forecast
+          rPackages.tictoc
+
+        ];
+
+        # Creating a symlink to the radian binary in the .bin directory is certainly not ideal. There is an isue on that: "https://github.com/REditorSupport/vscode-R/issues/1347"
+        # But it is the best way to make it work for now I guess.
+        shellHook = ''
+          mkdir -p .bin
+          ln -sf ${pkgs.python312Packages.radian}/bin/radian .bin/
+        '';
+      };
+    };
+}