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Dockerfile

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+FROM nginx:alpine
+
+# Copy entire project folder content into /usr/share/nginx/html
+COPY . /usr/share/nginx/html/
+
+# Copy startup.sh to root and make it executable
+COPY startup.sh /startup.sh
+RUN chmod +x /startup.sh
+
+# Create a minimal nginx.conf with access restriction for /startup.sh inline
+RUN printf '%s\n' \
+  'worker_processes auto;' \
+  '' \
+  'events { worker_connections 1024; }' \
+  '' \
+  'http {' \
+  '    include       mime.types;' \
+  '    default_type  application/octet-stream;' \
+  '    sendfile        on;' \
+  '' \
+  '    server {' \
+  '        listen       80;' \
+  '        server_name  localhost;' \
+  '        root   /usr/share/nginx/html;' \
+  '        index  index.html index.htm;' \
+  '' \
+  '        location = /startup.sh {' \
+  '            deny all;' \
+  '            return 403;' \
+  '        }' \
+  '' \
+  '        location / {' \
+  '            try_files $uri $uri/ =404;' \
+  '        }' \
+  '    }' \
+  '}' \
+  > /etc/nginx/nginx.conf
+
+EXPOSE 80
+
+# Use startup.sh as entrypoint to replace placeholders, then run nginx
+ENTRYPOINT ["/startup.sh"]