Fix Heroku deployment (#1272)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: santib <6373536+santib@users.noreply.github.com>

Author: Copilot

Dockerfile

@@ -79,12 +79,15 @@ USER "$USERNAME"
 WORKDIR "$APP_HOME"
 
 # Copy everything from the builder image
-COPY --link --chown="$USERNAME:$USERNAME" --chmod=700 . .
-COPY --from=builder --chown="$USERNAME:$USERNAME" --chmod=700 "$APP_HOME/public/" "$APP_HOME/public/"
-COPY --from=builder --chown="$USERNAME:$USERNAME" --chmod=700 "$APP_HOME/tmp/" "$APP_HOME/tmp/"
-COPY --from=builder --chown="$USERNAME:$USERNAME" --chmod=700 "$APP_HOME/vendor/" "$APP_HOME/vendor/"
+COPY --chown="$USERNAME:$USERNAME" . .
+COPY --from=builder --chown="$USERNAME:$USERNAME" "$APP_HOME/public/" "$APP_HOME/public/"
+COPY --from=builder --chown="$USERNAME:$USERNAME" "$APP_HOME/tmp/" "$APP_HOME/tmp/"
+COPY --from=builder --chown="$USERNAME:$USERNAME" "$APP_HOME/vendor/" "$APP_HOME/vendor/"
 
+# Set permissions (700 for security) and create symlink
+# Note: Permissions set via RUN instead of COPY --chmod for Heroku compatibility
 USER root
+RUN chmod -R 700 "$APP_HOME"
 RUN ln -s /usr/lib/*-linux-gnu/libjemalloc.so.2 /usr/lib/libjemalloc.so.2
 USER "$USERNAME"