Add alejandra to the dev container

Author: alex-sparus

.devcontainer/devcontainer.json

@@ -3,16 +3,14 @@
 {
 	"name": "Ubuntu",
 	"dockerFile": "Dockerfile",
-
 	"context": "${localWorkspaceFolder}",
 	"runArgs": [
-		"--security-opt", "label=disable"
+		"--security-opt",
+		"label=disable"
 	],
-
 	"mounts": [
 		"source=nix-ubuntu-container,target=/nix,type=volume"
 	],
-
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
 	// "image": "mcr.microsoft.com/devcontainers/base:${templateOption:imageVariant}"
 	// Features to add to the dev container. More info: https://containers.dev/features.
@@ -27,7 +25,8 @@
 			"extensions": [
 				"xaver.clang-format",
 				"arrterian.nix-env-selector",
-				"ms-vscode.cpptools"
+				"ms-vscode.cpptools",
+				"kamadorueda.alejandra"
 			]
 		}
 	},

flake.nix

@@ -93,6 +93,7 @@
             # for the llvm-symbolizer binary, that allows to show stacks in ASAN and LeakSanitizer.
             llvmPackages_latest.bintools-unwrapped
             cmake-format
+            alejandra
           ]
           ++ immer-archive-inputs;