Update Dockerfile

Dockerfile

@@ -11,7 +11,6 @@ COPY exdocker ./
 # Switch to root user to install curl, as apk requires root privileges
 USER root
 RUN apk add --no-cache curl
-
 # Switch back to the default non-root user for dind-rootless (usually 'docker')
 # This is important for security and proper operation of the rootless daemon
 USER docker
@@ -21,18 +20,35 @@ USER docker
 # 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 && \
+# The base image's ENTRYPOINT is `dockerd-rootless.sh`.
+# We override the default CMD to run our script.
+# Our script will:
+# 1. Start the rootless daemon in the background.
+# 2. Wait for the daemon to be ready.
+# 3. Perform the build and run of the inner Nginx container.
+# 4. Keep the outer container alive.
+CMD ["sh", "-c", "\
+    # Start the rootless Docker daemon in the background
+    /usr/local/bin/dockerd-rootless.sh & \
+    # Wait for the Docker daemon to be fully ready
+    # This loop is more robust than a fixed sleep
+    until docker info >/dev/null 2>&1; do \
+        echo 'Waiting for Docker daemon to start...'; \
+        sleep 1; \
+    done; \
+    echo 'Docker daemon is up and running!'; \
+    \
+    # Build the Nginx image using the copied exdocker Dockerfile
     docker build -f exdocker -t my-nginx-app . && \
+    \
+    # Run the Nginx container in detached mode, mapping its port 80
+    # to port 8080 *inside this DinD container*.
     docker run -d -p 8080:80 --name my-inner-nginx my-nginx-app && \
+    \
     echo 'Inner Nginx container started. Testing accessibility...' && \
+    \
+    # Test accessibility of the inner Nginx server
     curl http://localhost:8080 && \
+    \
+    # Keep this DinD container running indefinitely
     sleep infinity"]