add nix flake for dev environment

Gemfile.lock

@@ -8,32 +8,45 @@ GIT
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.1)
+    Ascii85 (1.1.0)
+    addressable (2.8.5)
       public_suffix (>= 2.0.2, < 6.0)
+    afm (0.2.2)
+    async (2.6.4)
+      console (~> 1.10)
+      fiber-annotation
+      io-event (~> 1.1)
+      timers (~> 4.1)
     colorator (1.1.0)
     concurrent-ruby (1.2.2)
+    console (1.23.2)
+      fiber-annotation
+      fiber-local
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
-    ethon (0.15.0)
+    ethon (0.16.0)
       ffi (>= 1.15.0)
     eventmachine (1.2.7)
     ffi (1.15.5)
+    fiber-annotation (0.2.0)
+    fiber-local (1.0.0)
     forwardable-extended (2.6.0)
-    google-protobuf (3.22.0)
-    google-protobuf (3.22.0-x86_64-darwin)
-    google-protobuf (3.22.0-x86_64-linux)
-    html-proofer (3.19.4)
+    google-protobuf (3.24.2)
+    hashery (2.1.2)
+    html-proofer (5.0.8)
       addressable (~> 2.3)
-      mercenary (~> 0.3)
+      async (~> 2.1)
       nokogiri (~> 1.13)
-      parallel (~> 1.10)
+      pdf-reader (~> 2.11)
       rainbow (~> 3.0)
       typhoeus (~> 1.3)
       yell (~> 2.0)
+      zeitwerk (~> 2.5)
     http_parser.rb (0.8.0)
-    i18n (1.12.0)
+    i18n (1.14.1)
       concurrent-ruby (~> 1.0)
+    io-event (1.3.2)
     jekyll (4.3.2)
       addressable (~> 2.4)
       colorator (~> 1.0)
@@ -63,46 +76,45 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.4.0)
-    mini_portile2 (2.8.1)
-    nokogiri (1.14.3)
-      mini_portile2 (~> 2.8.0)
+    mini_portile2 (2.8.4)
+    nokogiri (1.15.4)
+      mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
-    nokogiri (1.14.3-x86_64-darwin)
-      racc (~> 1.4)
-    nokogiri (1.14.3-x86_64-linux)
-      racc (~> 1.4)
-    parallel (1.22.1)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (5.0.1)
-    racc (1.6.2)
+    pdf-reader (2.11.0)
+      Ascii85 (~> 1.0)
+      afm (~> 0.2.1)
+      hashery (~> 2.0)
+      ruby-rc4
+      ttfunk
+    public_suffix (5.0.3)
+    racc (1.7.1)
     rainbow (3.1.1)
     rake (13.0.6)
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
-    rouge (4.1.0)
+    rexml (3.2.6)
+    rouge (4.1.3)
+    ruby-rc4 (0.1.5)
     safe_yaml (1.0.5)
-    sass-embedded (1.58.3)
-      google-protobuf (~> 3.21)
-      rake (>= 10.0.0)
-    sass-embedded (1.58.3-x86_64-darwin)
-      google-protobuf (~> 3.21)
-    sass-embedded (1.58.3-x86_64-linux)
-      google-protobuf (~> 3.21)
+    sass-embedded (1.66.1)
+      google-protobuf (~> 3.23)
+      rake (>= 13.0.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
+    timers (4.3.5)
+    ttfunk (1.7.0)
     typhoeus (1.4.0)
       ethon (>= 0.9.0)
     unicode-display_width (2.4.2)
     webrick (1.8.1)
     yell (2.2.2)
+    zeitwerk (2.6.11)
 
 PLATFORMS
   ruby
-  x86_64-darwin-20
-  x86_64-linux
 
 DEPENDENCIES
   html-proofer
@@ -111,4 +123,4 @@ DEPENDENCIES
   webrick (~> 1.8)
 
 BUNDLED WITH
-   2.4.6
+   2.4.19

flake.nix

@@ -0,0 +1,49 @@
+{
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = inputs @ { self, ... }:
+    (inputs.flake-utils.lib.eachDefaultSystem (system:
+      let
+
+        pkgs = import inputs.nixpkgs {
+          inherit system;
+        };
+
+        ruby = pkgs.ruby_3_0;
+
+        bundix = pkgs.bundix.override {
+          bundler = pkgs.bundler.override {
+            ruby = pkgs.ruby_3_0;
+          };
+        };
+
+        rubyGems = pkgs.bundlerEnv {
+          name = "ruby-gems-env";
+          inherit ruby;
+          gemdir = ./.;
+        };
+
+        shellPkgs = [
+          bundix
+          pkgs.bundler
+          ruby
+          rubyGems
+        ] ++ (with pkgs; [
+          nodejs-18_x
+        ]);
+
+      in
+      rec {
+
+        devShells = {
+          default = pkgs.mkShell {
+            buildInputs = shellPkgs;
+            BUNDLE_FORCE_RUBY_PLATFORM = "true";
+          };
+        };
+
+      }));
+}