Increase image size for mesh routers

src/freedombone-image

@@ -533,7 +533,7 @@ if [[ $VARIANT == 'mesh' ]]; then
     IMAGE_NAME=$'mesh'
     # typically not much disk space is needed for a mesh node
     if [ ! $IMAGE_SIZE_SPECIFIED ]; then
-        IMAGE_SIZE=3G
+        IMAGE_SIZE=5G
     fi
 fi