chore(nginx): add README

roles/nginx/README.md

@@ -0,0 +1,28 @@
+# `finallycoffee.services.nginx` ansible role
+
+## Description
+
+Runs `nginx`, a HTTP reverse proxy, in a docker container.
+
+## Usage
+
+For the role to do anything, `nginx_config` needs to be populated with the configuration for nginx.
+An example would be:
+
+```yaml
+nginx_config: |+
+  server {
+    listen 80 default_server;
+    server_name my.server.fqdn;
+    location / { return 200; }
+  }
+```
+
+The container is named `nginx` by default, this can be overridden in `nginx_container_name`.
+When running this role multiple times, `nginx_base_path` should also be changed for each run,
+otherwise the configuration files collide in the filesystem.
+
+For exposing this server to the host and/or internet, the `nginx_container_ports` (port forwarding host
+from host to container), `nginx_container_networks` (docker networking) or `nginx_container_labels`
+(for label-based routing discovery like traefik) can be used. The options correspond to the arguments
+of the `community.docker.docker_container` module.