Fix Nginx repo url

[arch=ARCH] instead of [arch=$ARCH]

was used

Author: jaapmarcus

install/hst-install-ubuntu.sh

@@ -605,7 +605,7 @@ echo
 # Installing Nginx repo
 
 echo "[ * ] NGINX"
-echo "deb [arch=ARCH] https://nginx.org/packages/mainline/$VERSION/ $codename nginx" > $apt/nginx.list
+echo "deb [arch=$ARCH] https://nginx.org/packages/mainline/$VERSION/ $codename nginx" > $apt/nginx.list
 apt-key adv --fetch-keys 'https://nginx.org/keys/nginx_signing.key' > /dev/null 2>&1
 
 # Installing sury PHP repo