Clean up some unneeded flags

auto/config

@@ -26,7 +26,7 @@ CURRENT_DATE=$(date +%Y%m%d)
 export SOURCE_DATE_EPOCH=$(date +%s)
 
 # repository URL
-PUREOS_REPO="https://repo.puri.sm/pureos"
+PUREOS_REPO="https://repo.pureos.net/pureos"
 
 # current architecture
 arch=$(dpkg --print-architecture)
@@ -180,6 +180,5 @@ lb config noauto \
     --iso-volume "PureOS $dist_version $FLAVOR_PRETTY" \
     --image-name $IMAGE_FILENAME \
     --linux-flavours $kernel_flavour \
-    --debootstrap-options '--merged-usr --keyring=/usr/share/keyrings/pureos-archive-keyring.gpg' \
     $lb_opts \
     "${@}"