Move shells to separate files

shells/tab.nix

@@ -0,0 +1,40 @@
+{ pkgs, inputs }: pkgs.devshell.mkShell {
+  name = "Tab";
+  imports = [ "${inputs.devshell}/extra/language/c.nix" ];
+  packages = with pkgs; [
+    (pkgs.lowPrio binutils)
+    findutils
+    gnumake
+    ruby_3_1
+    nodejs
+    yarn
+  ];
+  env = [
+    { name = "GEM_HOME"; eval = "$PRJ_DATA_DIR/bundle/$(ruby -e 'puts RUBY_VERSION')"; }
+    { name = "PATH"; prefix = "$GEM_HOME/bin"; }
+  ];
+  commands = [
+    {
+      name = "server-support";
+      category = "general commands";
+      help = "Run everything required for a server";
+      command = ''
+        bundle install
+      '';
+    }
+    {
+      name = "server";
+      category = "general commands";
+      help = "Run everything";
+      command = ''
+        server-support
+        rails s
+      '';
+    }
+  ];
+  language.c = {
+    compiler = pkgs.gcc;
+    includes = [ pkgs.sqlite pkgs.libmysqlclient pkgs.zlib ];
+    libraries = [ pkgs.sqlite pkgs.libmysqlclient pkgs.zlib ];
+  };
+}