This is a quick and easy way to write an HTML page directly in the same Dockerfile where you define the Nginx server.
Use case: I needed a very basic placeholder page for a project before it was actually put online. Since I use Coolify, which allows you to use a Dockerfile as an application's source, I could easily achieve the goal by simply editing the file directly within the dashboard and hitting "Deploy".
Below is the complete Dockerfile setup:
FROM nginx:alpine
# Create the HTML file
RUN echo '<!DOCTYPE html>\
<html>\
<head>\
<title>My new project</title>\
</head>\
<body>\
<p>Lorem ipsum</p>\
</body>\
</html>' > /usr/share/nginx/html/index.html
# Expose port 80
EXPOSE 80
# Run nginx in foreground
CMD ["nginx", "-g", "daemon off;"]