Add Dockerfile

docfx/Dockerfile

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+# Stage 1: Build DocFX site
+FROM mcr.microsoft.com/dotnet/sdk:10.0-alpine AS docfx-build
+
+# Create non-root user
+RUN addgroup -S docfx && adduser -S docfx -G docfx
+
+# Switch early
+USER docfx
+ENV HOME=/home/docfx
+ENV PATH="$PATH:/home/docfx/.dotnet/tools"
+
+WORKDIR /workspace
+
+# Install DocFX as docfx user
+RUN dotnet tool install -g docfx
+
+# Copy sources
+COPY --chown=docfx:docfx docfx ./docfx
+COPY --chown=docfx:docfx src ./src
+
+WORKDIR /workspace/docfx
+RUN docfx docfx_project/docfx.json
+
+# Stage 2: Runtime (Nginx)
+FROM nginx:alpine
+
+# Create non-root user
+RUN addgroup -S nginx-user && adduser -S nginx-user -G nginx-user
+
+# Prepare runtime directories
+RUN mkdir -p /var/cache/nginx /var/run \
+    && chown -R nginx-user:nginx-user /var/cache/nginx /var/run
+
+# Remove default content and config
+RUN rm -rf /usr/share/nginx/html/* \
+    && rm /etc/nginx/conf.d/default.conf
+
+# Copy static site
+COPY --from=docfx-build \
+     --chown=nginx-user:nginx-user \
+     /workspace/docfx/docfx_project/_site \
+     /usr/share/nginx/html
+
+# Provide nginx config
+COPY docfx/nginx.conf /etc/nginx/nginx.conf
+
+USER nginx-user
+
+EXPOSE 8080
+CMD ["nginx", "-g", "daemon off;"]

docfx/nginx.conf

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+pid /tmp/nginx.pid;
+worker_processes auto;
+
+events {
+    worker_connections 1024;
+}
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    server_tokens off;
+
+    sendfile on;
+    tcp_nopush on;
+    tcp_nodelay on;
+
+    keepalive_timeout 65;
+
+    server {
+        listen 8080;
+        root /usr/share/nginx/html;
+        index index.html;
+
+        location / {
+            try_files $uri $uri/ =404;
+        }
+    }
+}