dev: add tooling

Signed-off-by: Patrizio Bekerle <patrizio@bekerle.com>

.envrc

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+use nix

justfile

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+# Use `just <recipe>` to run a recipe
+# https://just.systems/man/en/
+
+# By default, run the `--list` command
+default:
+    @just --list
+
+# Variables
+
+zellijSession := "mono-app"
+
+# Open a terminal with the mono-app session
+[group('dev')]
+term-run:
+    zellij --layout term.kdl attach {{ zellijSession }} -c
+
+# Kill the mono-app session
+[group('dev')]
+term-kill:
+    -zellij delete-session {{ zellijSession }} -f
+
+# Kill and run a terminal with the mono-app session
+[group('dev')]
+term: term-kill term-run
+
+# Open a browser with the application
+[group('dev')]
+open-browser:
+    xdg-open https://127.0.0.1:8001/dist/de/mono-processpayment
+
+# Format all justfiles
+[group('linter')]
+just-format:
+    #!/usr/bin/env bash
+    # Find all files named "justfile" recursively and run just --fmt --unstable on them
+    find . -type f -name "justfile" -print0 | while IFS= read -r -d '' file; do
+        echo "Formatting $file"
+        just --fmt --unstable -f "$file"
+    done

shell.nix

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+{ pkgs ? import <nixpkgs> {} }:
+  pkgs.mkShell {
+    # nativeBuildInputs is usually what you want -- tools you need to run
+    nativeBuildInputs = with pkgs; [
+      nodejs_22
+      curl
+      zellij # smart terminal workspace
+      lazygit # git terminal
+      just # task runner
+    ];
+}
+

term.kdl

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+// https://zellij.dev/documentation/creating-a-layout
+layout {
+  tab name="main" focus=true {
+    pane size=1 borderless=true {
+      plugin location="zellij:tab-bar"
+    }
+    pane size="60%" {
+      command "lazygit"
+      focus true
+    }
+    pane split_direction="vertical" size="40%" {
+      pane {
+        command "npm"
+        args "run" "watch"
+      }
+      pane {
+        command "npm"
+        args "install"
+      }
+    }
+    pane size=1 borderless=true {
+      plugin location="zellij:status-bar"
+    }
+  }
+  tab name="term" {
+    pane size=1 borderless=true {
+      plugin location="zellij:tab-bar"
+    }
+    pane
+    pane size=1 borderless=true {
+      plugin location="zellij:status-bar"
+    }
+  }
+}