Update Dockerfile

Dockerfile

@@ -1,6 +1,6 @@
 FROM alpine:edge
 
-# 1. Install desktop, VNC, and missing xrdb utility
+# 1. Install desktop, VNC, and utilities
 RUN apk update && apk add --no-cache \
     bash \
     xfce4 \
@@ -17,11 +17,11 @@ RUN apk update && apk add --no-cache \
     ttf-dejavu \
     xrdb
 
-# 2. Fix permissions for both X11 and ICE Unix sockets so Xvfb doesn't crash
+# 2. Fix permissions for X11/ICE sockets
 RUN mkdir -p /tmp/.X11-unix /tmp/.ICE-unix && \
     chmod 1777 /tmp/.X11-unix /tmp/.ICE-unix
 
-# 3. Delete the XFCE power manager autostart to silence battery warnings
+# 3. Delete the XFCE power manager autostart
 RUN rm -f /etc/xdg/autostart/xfce4-power-manager.desktop
 
 # 4. Create a non-root user
@@ -29,9 +29,13 @@ RUN adduser -D -u 1000 user
 ENV HOME=/home/user
 ENV PATH=/home/user/.local/bin:$PATH
 
-# 5. Bulletproof Health Check Fix
+# 5. Bulletproof Health Check & Heartbeat Fix
+# Create the index.html redirect for HF health checks
 RUN echo '<meta http-equiv="refresh" content="0; url=vnc.html">' > /usr/share/novnc/index.html
 
+# Inject the JavaScript heartbeat into the VNC page so HF doesn't pause while in use
+RUN sed -i '/<\/head>/i \    <script>\n        setInterval(function() {\n            fetch("/");\n        }, 60000);\n    </script>' /usr/share/novnc/vnc.html
+
 WORKDIR $HOME
 
 # 6. Set VNC password and fix permissions
@@ -45,7 +49,7 @@ USER user
 # 8. Expose web port
 EXPOSE 7860
 
-# 9. Start everything (Fixed the bash timing sequence!)
+# 9. Start everything
 CMD bash -c "\
     Xvfb :0 -screen 0 1024x768x24 & \
     sleep 2 ; \