Make container use nginx

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.14
+FROM nginx:1.21.3-alpine
 
 RUN apk update
 RUN apk add certbot

README.md

@@ -21,6 +21,8 @@ services**.
   certificates, so that non-root users can access the certificates.
   Set the LEAVE_PERMISSIONS_AS_IS environment variable to instruct the
   container not to change permissions
+* If you setup the variable NGINX to any value, the container will
+  start nginx and reload after trying to renew the certificate
 
 ```
 docker run -e DOMAIN=example.com \
@@ -28,6 +30,21 @@ docker run -e DOMAIN=example.com \
               ungleich/ungleich-certbot
 ```
 
+### Nginx support
+
+Using
+
+```
+docker run -e DOMAIN=example.com \
+           -e EMAIL=root@example.com \
+           -e NGINX=yes \
+           -e STAGING=no \
+              ungleich/ungleich-certbot
+```
+
+you will get a proper, real world usable nginx server. Inject the
+nginx configuration by meains of a volume to /etc/nginx/conf.d
+
 ### Exiting after getting the certificate
 
 By default, the container will stay alive and try to renew the

entrypoint.sh

@@ -33,6 +33,12 @@ if [ "$ONLYGETCERT" ]; then
     exit 0
 fi
 
+# Still there? Start nginx if requested
+
+if [ "$NGINX" ]; then
+    nginx
+fi
+
 # Try to renew once per day
 while true; do
     /usr/bin/certbot renew
@@ -46,5 +52,8 @@ while true; do
 
     [ "$ONLYRENEWCERTSONCE" ] && exit 0
 
+    # reload nginx if we are running it
+    [ "$NGINX" ] && pkill -1 nginx
+
     sleep 86400
 done