feat: add zellij (#106)

* feat: add zellij

* chore: fix test

Author: BusHero

features/src/zellij/README.md

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+# tmux
+
+# 
+
+```json
+"features": {
+    "ghcr.io/bushero/devcontainers/features/tmux:1.0.0": {}
+}
+```
+
+---
+
+_Note: This file was auto-generated from the [devcontainer-feature.json](/features/src/tmux/devcontainer-feature.json). Add additional notes to a `Notes.md`._

features/src/zellij/devcontainer-feature.json

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+{
+	"$schema": "https://raw.githubusercontent.com/devcontainers/spec/main/schemas/devContainerFeature.schema.json",
+	"id": "tmux",
+	"version": "1.0.0",
+	"name": "tmux"
+}

features/src/zellij/install.sh

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+#!/bin/sh
+
+apk update
+apk upgrade
+apk add zellij

features/test/zellij/alpine.sh

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+#!/bin/sh
+set -e
+
+zellij --version

features/test/zellij/scenarios.json

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+{
+	"alpine": {
+		"image": "alpine:latest",
+		"features": {
+			"zellij": {}
+		}
+	}
+}