Update Dockerfile

Dockerfile

@@ -1,3 +1,33 @@
+# Use the rootless Docker-in-Docker base image
 FROM docker:dind-rootless
 
-RUN docker --version
+# Set the working directory inside the container
+WORKDIR /app
+
+# Copy the Nginx app's index.html and its Dockerfile (now named exdocker) into this container
+COPY index.html ./
+COPY exdocker ./
+
+# Install curl to test the inner Nginx server
+RUN apk add --no-cache curl
+
+# Expose a port from this DinD container.
+# We'll map the inner Nginx container's port 80 to this port (e.g., 8080)
+# within the DinD container. Then, we can map this 8080 to the host.
+EXPOSE 8080
+
+# Define the entrypoint to start the rootless Docker daemon
+ENTRYPOINT ["/usr/local/bin/dockerd-rootless.sh"]
+
+# Define the command to execute once the daemon is up:
+# 1. Wait for the Docker daemon to be ready (sleep 5 seconds).
+# 2. Build the Nginx image using the copied Dockerfile (exdocker).
+# 3. Run the Nginx container in detached mode, mapping its port 80
+#    to port 8080 *inside this DinD container*.
+# 4. Keep this DinD container running indefinitely.
+CMD ["sh", "-c", "sleep 5 && \
+    docker build -f exdocker -t my-nginx-app . && \
+    docker run -d -p 8080:80 --name my-inner-nginx my-nginx-app && \
+    echo 'Inner Nginx container started. Testing accessibility...' && \
+    curl http://localhost:8080 && \
+    sleep infinity"]