Add devshell

.envrc

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+
+use flake

.github/ISSUE_TEMPLATE.md

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+# Context
+
+
+# Definition of done
+
+
+# Out of scope/Future work
+

.github/PULL_REQUEST_TEMPLATE.md

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+# Context
+
+
+# Important Changes Introduced

.github/workflows/validate-devshell.yml

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+on:
+  push:
+
+jobs:
+  validate-devshell:
+    strategy:
+      matrix:
+        system: ["x86_64-linux", "aarch64-linux", "x86_64-darwin", "aarch64-darwin"]
+    runs-on: ubuntu-latest
+    steps:
+    - name: 📥 Checkout repository
+      uses: actions/[email protected]
+    - name: 🧰 Setup Nix
+      uses: nixbuild/nix-quick-install-action@v28
+    - name: 🚀 Eval
+      run: nix eval .#devShells.${{matrix.system}}.default --apply toString
+

.gitignore

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+.direnv
+result*
 /target

README.md

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+# firefly-cardano
+
+
+## Getting Set Up
+
+Install Nix:
+```console
+# Install Nix
+curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install
+
+# Enter devshell:
+nix develop
+```
+
+### (Optional) Install direnv
+Should you prefer to load the devshell automatically when in a terminal
+
+- Install Direnv:
+  ```
+  # Install direnv
+  nix profile install nixpkgs#direnv
+
+  # Configure your shell to load direnv everytime you enter this project (If you do not use bash see: https://direnv.net/docs/hook.html)
+  echo 'eval "$(direnv hook bash)"' >> ~/.bashrc
+
+  # And in case your system does not automatically .bashrc
+  echo 'eval "$(direnv hook bash)"' >> ~/.bash_profile
+  ```
+
+- Renter the shell for direnv to take effect
+- Trust direnv config (.envrc), whitelisting is required whenever this file changes
+  ```
+  direnv allow
+  ```
+

flake.nix

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+{
+  description = "firefly-cardano";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+
+    devshell.url = "github:numtide/devshell";
+    devshell.inputs.nixpkgs.follows = "";
+
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";
+  };
+
+  outputs = {...} @ inputs:
+    inputs.flake-parts.lib.mkFlake {inherit inputs;} {
+      systems = ["x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin"];
+      imports = with inputs; [
+        devshell.flakeModule
+      ];
+
+      perSystem = {
+        pkgs,
+        system,
+        self',
+        config,
+        ...
+      }: {
+        devshells.default = {
+          name = "firefly-cardano";
+          imports = [
+            "${inputs.devshell}/extra/language/rust.nix"
+          ];
+
+          packages = with pkgs; [
+            alejandra
+          ];
+
+          commands = [
+            {package = pkgs.treefmt;}
+            {package = pkgs.just;}
+          ];
+
+          devshell.startup.setup.text = ''
+            [ -e $PRJ_ROOT/.envrc.local ] && source $PRJ_ROOT/.envrc.local
+          '';
+        };
+      };
+    };
+}

treefmt.toml

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+[formatter]
+[formatter.alejandra]
+command = "alejandra"
+excludes = []
+includes = ["*.nix"]
+options = []
+
+[formatter.rustfmt]
+command = "rustfmt"
+excludes = []
+includes = ["*.rs"]
+options = ["--edition", "2021", "--config", "skip_children=true"]
+
+[global]
+excludes = ["*.lock", "*.patch", ".gitignore", ".gitmodules"]