feat: add flake.nix and Dev Container configuration

.devcontainer.json

@@ -0,0 +1,14 @@
+{
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "mkhl.direnv",
+        "hashicorp.terraform",
+        "ms-azuretools.vscode-azureterraform"
+      ]
+    }
+  },
+  "image": "ghcr.io/cachix/devenv:latest",
+  "overrideCommand": false,
+  "updateContentCommand": ["direnv","reload"]
+}

.envrc

@@ -0,0 +1,10 @@
+if ! has nix_direnv_version || ! nix_direnv_version 2.2.1; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.2.1/direnvrc" "sha256-zelF0vLbEl5uaqrfIzbgNzJWGmLzCmYAkInj/LNxvKs="
+fi
+
+watch_file flake.nix
+watch_file flake.lock
+if ! use flake . --no-pure-eval --accept-flake-config
+then
+  echo "devenv could not be built. The devenv environment was not loaded. Make the necessary changes to devenv.nix and hit enter to try again." >&2
+fi

.gitignore

@@ -2,4 +2,7 @@
 terraform.exe
 *.tfvars
 *.tfbackend
-.idea/
+.idea/
+.devenv
+.direnv
+.pre-commit-config.yaml

flake.nix

@@ -0,0 +1,55 @@
+{
+  inputs = {
+    nixpkgs.url = "github:cachix/devenv-nixpkgs/rolling";
+    systems.url = "github:nix-systems/default";
+    devenv.url = "github:cachix/devenv";
+    devenv.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  nixConfig = {
+    extra-trusted-public-keys = "devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw=";
+    extra-substituters = "https://devenv.cachix.org";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    devenv,
+    systems,
+    ...
+  } @ inputs: let
+    forEachSystem = nixpkgs.lib.genAttrs (import systems);
+  in {
+    packages = forEachSystem (system: {
+      devenv-up = self.devShells.${system}.default.config.procfileScript;
+      devenv-test = self.devShells.${system}.default.config.test;
+    });
+
+    devShells =
+      forEachSystem
+      (system: let
+        pkgs = import nixpkgs {
+          inherit system;
+          config.allowUnfree = true;
+        };
+      in {
+        default = devenv.lib.mkShell {
+          inherit inputs pkgs;
+          modules = [
+            {
+              # https://devenv.sh/reference/options/
+              packages = [pkgs.azure-cli];
+              languages.terraform.enable = true;
+
+              git-hooks.hooks.terraform-fmt = {
+                enable = true;
+                name = "Terraform fmt check";
+                entry = "terraform fmt --recursive";
+                pass_filenames = false;
+              };
+            }
+          ];
+        };
+      });
+  };
+}