Add shell linting and tidying and update all shell scripts

install-cross-nix.sh

@@ -9,7 +9,7 @@ VERSION="$2"
 
 cd "$CROSS_DIR"
 
-if [[ -n "$VERSION" ]] && ! [[ "$VERSION" =~ ^v ]]; then
+if [[ -n $VERSION ]] && ! [[ $VERSION =~ ^v ]]; then
     cargo install cross --git https://github.com/cross-rs/cross --rev "$VERSION"
     mv "$HOME/.cargo/bin/cross" .
     exit 0
@@ -22,6 +22,7 @@ fi
 
 export TARGET=.
 curl --silent --location \
-     https://raw.githubusercontent.com/houseabsolute/ubi/master/bootstrap/bootstrap-ubi.sh |
+    https://raw.githubusercontent.com/houseabsolute/ubi/master/bootstrap/bootstrap-ubi.sh |
     sh
+# shellcheck disable=SC2086
 ./ubi --project cross-rs/cross --matching musl --in . $VERSION_ARGS