add update script

Author: evertramos

docker-compose.yml

@@ -1,6 +1,6 @@
 version: '3'
 services:
-  nginx:
+  nginx-web:
     image: nginx
     labels:
         com.github.jrcs.letsencrypt_nginx_proxy_companion.nginx_proxy: "true"

update.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+#
+# This scrip update the web proxy without downtime
+#
+# Source: https://github.com/evertramos/docker-compose-letsencrypt-nginx-proxy-companion
+#
+
+# 1. Check if .env file exists
+if [ -e .env ]; then
+    source .env
+else 
+    echo 
+    echo "Please set up your .env file before starting your enviornment."
+    echo 
+    exit 1
+fi
+
+# 2. Update your repo
+git pull
+git checkout master
+
+# 3. Check if your env files has the same line numbers
+if [ "$(wc -l .env | cut -f1 -d' ')" != "$(wc -l .env.sample | cut -f1 -d' ')" ]; then
+    echo
+    echo "The sample .env are different from the your current .env file."
+    echo "Please update your .env file to continue."
+    echo "It must has the same lines of the sample env file."
+    echo
+    echo "If you keep receiving this message please check the number of line of both files"
+    echo
+fi
+
+# 3. Download the latest version of nginx.tmpl
+curl https://raw.githubusercontent.com/jwilder/nginx-proxy/master/nginx.tmpl > nginx.tmpl
+
+# 4. Update containers without downtime
+docker-compose up -d --no-deps --build nginx-web
+docker-compose up -d --no-deps --build nginx-gen
+docker-compose up -d --no-deps --build nginx-letsencrypt
+
+exit 0