Keep file after compressing image

.gitlab-ci.yml

@@ -46,7 +46,7 @@ build-zynthbox-image-armhf:
     - echo "Image Size -> $(du -h ./workspace/$image_name)"
     # Compress rpi4 image
     - echo "# Compress image"
-    - xz -zv --threads=12 --memory=100% ./workspace/$image_name
+    - xz -kzv --threads=12 --memory=100% ./workspace/$image_name
     - echo "Compressed rpi4 Image Size -> $(du -h ./workspace/$image_name.xz)"
     # Push compressed rpi4 image to pub.zynthbox.io
     - echo "# Push compressed rpi4 image to pub.zynthbox.io"