fix unbound skip tarbal

Author: antheas

build.sh

@@ -5,6 +5,7 @@ set -eoux pipefail
 FEDORA_VERSION=${FEDORA_VERSION:-43}
 BUILDER_VERSION=${BUILDER_VERSION:-$FEDORA_VERSION}
 BUILD_ARM=${BUILD_ARM:-}
+SKIP_TARBAL=${SKIP_TARBAL:-}
 
 if [ -n "$BUILD_ARM" ]; then
     ARCHES=("aarch64")