docker: Switch to nginx in docker image (#2721)

Co-authored-by: Yaman Qalieh <ybq987@gmail.com>

config/nginx.conf

@@ -0,0 +1,17 @@
+server {
+    listen 80 default_server;
+    root /app;
+    access_log /var/log/nginx/rssbridge.access.log;
+    error_log /var/log/nginx/rssbridge.error.log;
+    index index.php;
+
+    location ~ /(\.|vendor|tests) {
+        deny all;
+        return 403; # Forbidden
+    }
+
+    location ~ \.php$ {
+        include snippets/fastcgi-php.conf;
+        fastcgi_pass 127.0.0.1:9000;
+    }
+}