Add dev shell to hydra

hydra/shells/README.md

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+# Shells
+
+Builds this repo's sorry excuse of a dev shell, to allow me to more quickly
+write an ever-increasing abomination of a code base.

hydra/shells/default.nix

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+# This file is part of Nix++.
+# Copyright (C) 2023 Leandro Emmanuel Reina Kiperman.
+#
+# Nix++ is free software: you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the Free Software
+# Foundation, either version 3 of the License, or (at your option) any later
+# version.
+#
+# Nix++ is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+{ self, ... } @ _inputs: {
+  # Cherry picked scenarios, since I have only a subset of "supported systems"
+  # as hydra builders.
+
+  inherit (self.devShells)
+    x86_64-linux
+    ;
+}