Add the assigment to run nginx read only

[refs #d8b6ba92fa7e]

Author: jfahrer

nginx/assignment4.md

@@ -0,0 +1,19 @@
+## Running nginx read only
+* Use your nginx image
+* Run the nginx container with the read-only flag
+* Use a tmpfs where needed
+
+## The Dockerfile
+```
+FROM debian:buster-slim
+
+RUN apt-get update \
+      && apt-get install -y nginx \
+      && rm -rf /var/lib/apt/lists/* \
+      && rm /var/log/nginx/access.log \
+      && rm /var/log/nginx/error.log \
+      && ln -s /dev/stdout /var/log/nginx/access.log \
+      && ln -s /dev/stderr /var/log/nginx/error.log
+
+CMD ["/usr/sbin/nginx", "-g", "daemon off;"]
+```