Add dev flake

.envrc

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+use flake ./dev

.gitignore

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+.direnv

dev/flake.lock

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+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1685662779,
+        "narHash": "sha256-cKDDciXGpMEjP1n6HlzKinN0H+oLmNpgeCTzYnsA2po=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "71fb97f0d875fd4de4994dfb849f2c75e17eb6c3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "flake-root": {
+      "locked": {
+        "lastModified": 1680964220,
+        "narHash": "sha256-dIdTYcf+KW9a4pKHsEbddvLVSfR1yiAJynzg2x0nfWg=",
+        "owner": "srid",
+        "repo": "flake-root",
+        "rev": "f1c0b93d05bdbea6c011136ba1a135c80c5b326c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "srid",
+        "repo": "flake-root",
+        "type": "github"
+      }
+    },
+    "mission-control": {
+      "locked": {
+        "lastModified": 1683658484,
+        "narHash": "sha256-JkGnWyYZxOnyOhztrxLSqaod6+O/3rRypq0dAqA/zn0=",
+        "owner": "Platonic-Systems",
+        "repo": "mission-control",
+        "rev": "a0c93bd764a3c25e6999397e9f5f119c1b124e38",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Platonic-Systems",
+        "repo": "mission-control",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1687274257,
+        "narHash": "sha256-TutzPriQcZ8FghDhEolnHcYU2oHIG5XWF+/SUBNnAOE=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "2c9ecd1f0400076a4d6b2193ad468ff0a7e7fdc5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "dir": "lib",
+        "lastModified": 1685564631,
+        "narHash": "sha256-8ywr3AkblY4++3lIVxmrWZFzac7+f32ZEhH/A8pNscI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "4f53efe34b3a8877ac923b9350c874e3dcd5dc0a",
+        "type": "github"
+      },
+      "original": {
+        "dir": "lib",
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "flake-root": "flake-root",
+        "mission-control": "mission-control",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

dev/flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    flake-root.url = "github:srid/flake-root";
+    mission-control.url = "github:Platonic-Systems/mission-control";
+  };
+  outputs = inputs@{ self, nixpkgs, flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = nixpkgs.lib.systems.flakeExposed;
+      imports = [
+        inputs.flake-root.flakeModule
+        inputs.mission-control.flakeModule
+      ];
+      perSystem = { pkgs, lib, config, ... }: {
+        mission-control.scripts = {
+          ex = {
+            description = "Run example";
+            exec = "cd ./example && nix run . --override-input services-flake ..";
+          };
+          test = {
+            description = "Run test";
+            exec = "./test.sh";
+          };
+          fmt = {
+            description = "Format the top-level Nix files";
+            exec = "${lib.getExe pkgs.nixpkgs-fmt} ./*.nix";
+          };
+        };
+        devShells.default = pkgs.mkShell {
+          # cf. https://haskell.flake.page/devshell#composing-devshells
+          inputsFrom = [ config.mission-control.devShell ];
+        };
+      };
+    };
+}