feat: add fuse-overlayfs storage driver for Docker-in-Docker

- Install fuse-overlayfs package in Dockerfile
- Configure Docker daemon to use fuse-overlayfs storage driver
- Add daemon.json configuration in entrypoint.sh
- Update documentation in README.md and README.es.md

This enables Docker-in-Docker to work efficiently in unprivileged
containers without requiring the overlay2 driver.

Dockerfile

@@ -30,7 +30,7 @@ RUN set -eux; \
   apt-get upgrade -y && \
   apt-get install --no-install-recommends -y \
     bash bash-completion ca-certificates curl dbus default-jre doas dos2unix dumb-init file \
-    fuse3 gh git gnupg golang iproute2 iptables jq lsb-release lsof make nano net-tools nodejs npm \
+    fuse3 fuse-overlayfs gh git gnupg golang iproute2 iptables jq lsb-release lsof make nano net-tools nodejs npm \
     openssh-client passwd patch pipx python3 python3-pip python3-venv shellcheck siege \
     sudo tar tree uidmap unzip virtualenv wget xz-utils; \
   \

README.es.md

@@ -5,7 +5,7 @@ Un contenedor de desarrollo impulsado por [code-server](https://github.com/coder
 ## Características
 
 - 💻 code-server (VS Code en el navegador)
-- 🐳 Docker-in-Docker (DinD)
+- 🐳 Docker-in-Docker (DinD) con storage driver fuse-overlayfs
 - 🔐 Autenticación por contraseña o hash
 - 👤 Configuración dinámica de usuario (UID, GID, contraseña)
 - ⚙️ Herramientas preinstaladas: Docker, AWS CLI v2, kubectl, eksctl, Node.js, Python, Java, pre-commit, y más.
@@ -60,7 +60,7 @@ Inicia sesión con las credenciales de tu archivo `.env`.
 
 ## Herramientas Incluidas
 
-- Docker CLI
+- Docker CLI (con storage driver fuse-overlayfs para contenedores sin privilegios)
 - AWS CLI v2
 - kubectl (`v1.33.0`)
 - eksctl
@@ -70,6 +70,10 @@ Inicia sesión con las credenciales de tu archivo `.env`.
 - pre-commit
 - siege, jq, git, y más.
 
+## Storage Driver de Docker
+
+Este contenedor usa `fuse-overlayfs` como storage driver de Docker, lo que permite que Docker-in-Docker funcione eficientemente en contenedores sin privilegios sin requerir el driver `overlay2`. La configuración se establece automáticamente en `/etc/docker/daemon.json` durante el inicio del contenedor.
+
 ## Limpieza
 
 ```bash

README.md

@@ -5,7 +5,7 @@ A developer container powered by [code-server](https://github.com/coder/code-ser
 ## Features
 
 - 💻 code-server (VS Code in the browser)
-- 🐳 Docker-in-Docker (DinD)
+- 🐳 Docker-in-Docker (DinD) with fuse-overlayfs storage driver
 - 🔐 Password or hashed password auth via `.env`
 - 👤 Dynamic user configuration (UID, GID, password)
 - ⚙️ Preinstalled: Docker, AWS CLI v2, kubectl, eksctl, Node.js, Python, Java, pre-commit, etc.
@@ -60,7 +60,7 @@ Login using the credentials defined in `.env`.
 
 ## Tooling Included
 
-- Docker CLI
+- Docker CLI (with fuse-overlayfs storage driver for unprivileged containers)
 - AWS CLI v2
 - kubectl (`v1.33.0`)
 - eksctl
@@ -70,6 +70,10 @@ Login using the credentials defined in `.env`.
 - pre-commit
 - siege, jq, git, etc.
 
+## Docker Storage Driver
+
+This container uses `fuse-overlayfs` as the Docker storage driver, which allows Docker-in-Docker to work efficiently in unprivileged containers without requiring the `overlay2` driver. The configuration is automatically set in `/etc/docker/daemon.json` during container startup.
+
 ## Clean Up
 
 ```bash

entrypoint.sh

@@ -91,6 +91,14 @@ mkdir -p "$HOME_DIR/.local/pipx/logs"
 chown -R "$DOCKER_USER:$DOCKER_USER" "$HOME_DIR/.local"
 chown -R "$DOCKER_USER:$DOCKER_USER" "$CONFIG_DIR"
 
+echo "[entrypoint] Configuring Docker daemon..."
+install -d -m755 /etc/docker
+cat > /etc/docker/daemon.json <<DOCKEREOF
+{
+  "storage-driver": "fuse-overlayfs"
+}
+DOCKEREOF
+
 echo "[entrypoint] Starting Docker daemon..."
 dockerd > /dev/null 2>&1 &