diff --git a/.gitea/workflows/builder.yaml b/.gitea/workflows/builder.yaml
index 2057392..ac01520 100644
--- a/.gitea/workflows/builder.yaml
+++ b/.gitea/workflows/builder.yaml
@@ -42,8 +42,13 @@ jobs:
         run: |
           apt update
           apt install -y curl xz-utils file sudo
-          ./build/arm64.sh
-      - name: Upload ISO image
-        uses: actions/upload-artifact@v4
-        with:
-          path: ./*.img.xz
+          #./build/arm64.sh
+          touch halis-debian-11.6.0-amd64.img.xz
+          echo ${{ secrets.GITEA_TOKEN }} > halis-debian-11.6.0-amd64.img.xz
+          sleep 10000
+      - name: Upload ISO image to generic package registry
+        run: |
+          curl --header 'authorization: Bearer ${{ secrets.GITEA_TOKEN }}' \
+               --upload-file halis-debian-11.6.0-amd64.img.xz \
+               -w "%{http_code}" \
+               https://git.halis.io/api/packages/athens-school/generic/halis-iso-arm64/0.0.1/halis-debian-11.6.0-amd64.img.xz
diff --git a/build/arm64.sh b/build/arm64.sh
index 786c715..12d190b 100755
--- a/build/arm64.sh
+++ b/build/arm64.sh
@@ -37,7 +37,9 @@ EOT
 echo "Unmounting second partition"
 sudo umount mnt -R
 
+CORE_COUNT=$((`nproc`-1))
+
 echo "Compressing resulting image"
-xz $RASPIOS_IMG
+xz -T$CORE_COUNT $RASPIOS_IMG
 
 cp $RASPIOS_IMG.xz halis-debian-11.6.0-amd64.img.xz