Disable pleroma on ARM systems

It requires node-sass which won't install on ARM

src/freedombone-app-gnusocial

     #install_gnusocial_plugin_sharings_theme
     #install_gnusocial_plugin_nsfw
 
-    function_check install_nodejs
-    install_nodejs pleroma-gnusocial
-    install_pleroma "gnusocial" "$GNUSOCIAL_DOMAIN_NAME" "$GNUSOCIAL_BACKGROUND_IMAGE_URL" "$GNUSOCIAL_TITLE"
+    # Currently Pleroma won't install on ARM systems
+    # because it uses node-sass which doesn't support ARM
+    if [[ "$(arch)" != "arm*" ]]; then
+        function_check install_nodejs
+        install_nodejs pleroma-gnusocial
+        install_pleroma "gnusocial" "$GNUSOCIAL_DOMAIN_NAME" "$GNUSOCIAL_BACKGROUND_IMAGE_URL" "$GNUSOCIAL_TITLE"
+    fi
 
     # unleash the daemons!
     /etc/cron.hourly/gnusocial-daemons