Fix file uploads: disable nginx client_max_body_size limit

nginx defaults to 1MB max body size, which blocks Streamlit file
uploads with a 400 error. Set to 0 (unlimited) to let Streamlit
enforce its own 200MB limit from config.toml.

https://claude.ai/code/session_018VEL5xKZfe4LCcUa8iUHJ9

Author: claude

Dockerfile

@@ -200,7 +200,7 @@ if [ "$SERVER_COUNT" -gt 1 ]; then\n\
 \n\
     # Write nginx config\n\
     mkdir -p /etc/nginx\n\
-    echo -e "worker_processes auto;\\npid /run/nginx.pid;\\n\\nevents {\\n    worker_connections 1024;\\n}\\n\\nhttp {\\n    upstream streamlit_backend {\\n        least_conn;\\n${UPSTREAM_SERVERS}    }\\n\\n    map \\$http_upgrade \\$connection_upgrade {\\n        default upgrade;\\n        \\x27\\x27 close;\\n    }\\n\\n    server {\\n        listen 8501;\\n\\n        location / {\\n            proxy_pass http://streamlit_backend;\\n            proxy_http_version 1.1;\\n            proxy_set_header Upgrade \\$http_upgrade;\\n            proxy_set_header Connection \\$connection_upgrade;\\n            proxy_set_header Host \\$host;\\n            proxy_set_header X-Real-IP \\$remote_addr;\\n            proxy_set_header X-Forwarded-For \\$proxy_add_x_forwarded_for;\\n            proxy_set_header X-Forwarded-Proto \\$scheme;\\n            proxy_read_timeout 86400;\\n            proxy_send_timeout 86400;\\n            proxy_buffering off;\\n        }\\n    }\\n}" > /etc/nginx/nginx.conf\n\
+    echo -e "worker_processes auto;\\npid /run/nginx.pid;\\n\\nevents {\\n    worker_connections 1024;\\n}\\n\\nhttp {\\n    client_max_body_size 0;\\n\\n    upstream streamlit_backend {\\n        least_conn;\\n${UPSTREAM_SERVERS}    }\\n\\n    map \\$http_upgrade \\$connection_upgrade {\\n        default upgrade;\\n        \\x27\\x27 close;\\n    }\\n\\n    server {\\n        listen 8501;\\n\\n        location / {\\n            proxy_pass http://streamlit_backend;\\n            proxy_http_version 1.1;\\n            proxy_set_header Upgrade \\$http_upgrade;\\n            proxy_set_header Connection \\$connection_upgrade;\\n            proxy_set_header Host \\$host;\\n            proxy_set_header X-Real-IP \\$remote_addr;\\n            proxy_set_header X-Forwarded-For \\$proxy_add_x_forwarded_for;\\n            proxy_set_header X-Forwarded-Proto \\$scheme;\\n            proxy_read_timeout 86400;\\n            proxy_send_timeout 86400;\\n            proxy_buffering off;\\n        }\\n    }\\n}" > /etc/nginx/nginx.conf\n\
 \n\
     # Start Streamlit instances on internal ports (localhost only)\n\
     for i in $(seq 0 $((SERVER_COUNT - 1))); do\n\

Dockerfile_simple

@@ -112,7 +112,7 @@ if [ "$SERVER_COUNT" -gt 1 ]; then\n\
 \n\
     # Write nginx config\n\
     mkdir -p /etc/nginx\n\
-    echo -e "worker_processes auto;\\npid /run/nginx.pid;\\n\\nevents {\\n    worker_connections 1024;\\n}\\n\\nhttp {\\n    upstream streamlit_backend {\\n        least_conn;\\n${UPSTREAM_SERVERS}    }\\n\\n    map \\$http_upgrade \\$connection_upgrade {\\n        default upgrade;\\n        \\x27\\x27 close;\\n    }\\n\\n    server {\\n        listen 8501;\\n\\n        location / {\\n            proxy_pass http://streamlit_backend;\\n            proxy_http_version 1.1;\\n            proxy_set_header Upgrade \\$http_upgrade;\\n            proxy_set_header Connection \\$connection_upgrade;\\n            proxy_set_header Host \\$host;\\n            proxy_set_header X-Real-IP \\$remote_addr;\\n            proxy_set_header X-Forwarded-For \\$proxy_add_x_forwarded_for;\\n            proxy_set_header X-Forwarded-Proto \\$scheme;\\n            proxy_read_timeout 86400;\\n            proxy_send_timeout 86400;\\n            proxy_buffering off;\\n        }\\n    }\\n}" > /etc/nginx/nginx.conf\n\
+    echo -e "worker_processes auto;\\npid /run/nginx.pid;\\n\\nevents {\\n    worker_connections 1024;\\n}\\n\\nhttp {\\n    client_max_body_size 0;\\n\\n    upstream streamlit_backend {\\n        least_conn;\\n${UPSTREAM_SERVERS}    }\\n\\n    map \\$http_upgrade \\$connection_upgrade {\\n        default upgrade;\\n        \\x27\\x27 close;\\n    }\\n\\n    server {\\n        listen 8501;\\n\\n        location / {\\n            proxy_pass http://streamlit_backend;\\n            proxy_http_version 1.1;\\n            proxy_set_header Upgrade \\$http_upgrade;\\n            proxy_set_header Connection \\$connection_upgrade;\\n            proxy_set_header Host \\$host;\\n            proxy_set_header X-Real-IP \\$remote_addr;\\n            proxy_set_header X-Forwarded-For \\$proxy_add_x_forwarded_for;\\n            proxy_set_header X-Forwarded-Proto \\$scheme;\\n            proxy_read_timeout 86400;\\n            proxy_send_timeout 86400;\\n            proxy_buffering off;\\n        }\\n    }\\n}" > /etc/nginx/nginx.conf\n\
 \n\
     # Start Streamlit instances on internal ports (localhost only)\n\
     for i in $(seq 0 $((SERVER_COUNT - 1))); do\n\