feat(docker): add start.sh to honor (default 7860) and log bind; expose 7860/3000; stop port flapping

Dockerfile

@@ -11,15 +11,22 @@ RUN npm ci
 # Copy the rest of the application
 COPY --chown=1000 . .
 
+# Ensure start script is executable
+USER root
+RUN chmod +x /usr/src/app/start.sh
+USER 1000
+
 # Build the app
 RUN npm run build
 
-# Expose default Next.js port; runtime will honor $PORT
+# Expose both common ports (Space sets $PORT; we honor it at runtime)
+EXPOSE 7860
 EXPOSE 3000
 
 ENV HOST=0.0.0.0
+ENV PORT=7860
 # Disable telemetry and ensure production env
 ENV NEXT_TELEMETRY_DISABLED=1
 ENV NODE_ENV=production
-# Run Next directly and honor $PORT, defaulting to 3000
-CMD ["sh", "-c", "node node_modules/next/dist/bin/next start -H 0.0.0.0 -p ${PORT:-3000}"]
+# Start via script that logs and honors $PORT
+CMD ["/usr/src/app/start.sh"]

start.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+set -e
+
+# Honor Space-provided PORT, default to 7860 for Docker Spaces
+PORT_TO_USE="${PORT:-7860}"
+HOST_TO_USE="${HOST:-0.0.0.0}"
+
+echo "Starting Next.js on ${HOST_TO_USE}:${PORT_TO_USE}"
+exec node node_modules/next/dist/bin/next start -H "${HOST_TO_USE}" -p "${PORT_TO_USE}"