Add cross-version parameter to specify cross version

install-cross-nix.sh

@@ -3,9 +3,16 @@ set -x
 set -o pipefail
 
 CROSS_DIR="$1"
+VERSION="$2"
+
+VERSION_ARGS=""
+if [ -n "$VERSION" ]; then
+    VERSION_ARGS="--tag $VERSION"
+fi
+
 cd "$CROSS_DIR"
 export TARGET=.
 curl --silent --location \
      https://raw.githubusercontent.com/houseabsolute/ubi/master/bootstrap/bootstrap-ubi.sh |
     sh
-./ubi --project cross-rs/cross --matching musl --in .
+./ubi --project cross-rs/cross --matching musl --in . $VERSION_ARGS