Devcontainer: Add a Fedora 41 devcontainer for use in CI

.devcontainer/features/ladybird/install-fedora.sh

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+#!/bin/sh
+set -e
+
+# Git and GitHub CLI
+dnf install -y git gh
+
+# Ladybird dev dependencies
+dnf install -y autoconf-archive automake ccache cmake curl google-noto-sans-mono-fonts liberation-sans-fonts libglvnd-devel \
+    nasm ninja-build perl-FindBin perl-IPC-Cmd perl-lib qt6-qtbase-devel qt6-qtmultimedia-devel qt6-qttools-devel \
+    qt6-qtwayland-devel tar unzip zip zlib-ng-compat-static

.devcontainer/fedora-ci/Dockerfile

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+ARG VERSION
+FROM fedora:$VERSION

.devcontainer/fedora-ci/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json.
+{
+    "name": "Fedora CI",
+    // Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+    "build": {
+        "context": ".",
+        "dockerfile": "Dockerfile",
+        "args": {
+            "VERSION": "${localEnv:VERSION:41}"
+        }
+    },
+
+    // Features to add to the dev container. More info: https://containers.dev/features.
+    "features": {
+        "ghcr.io/devcontainers/features/common-utils:2": {},
+        "../features/ladybird" : {
+            "distro": "fedora"
+        }
+    },
+
+    // Use 'forwardPorts' to make a list of ports inside the container available locally.
+    // "forwardPorts": [],
+
+    // Use 'postCreateCommand' to run commands after the container is created.
+    // "postCreateCommand": "uname -a",
+
+    // Configure tool-specific properties.
+
+    // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+    "remoteUser": "vscode"
+}