chore: Use npm ci in ci.

If checking out opticss for the first time, bootstrap it with the --ci
option so that it uses the lockfile and errors predictably.

Author: chriseppstein

scripts/checkout-opticss.sh

@@ -13,11 +13,11 @@ then
   git fetch origin
   git checkout $BRANCH
   git pull
-  cd -
+  lerna bootstrap --registry=https://registry.npmjs.org/
 else
   git clone -b $BRANCH --depth 1 git@github.com:css-blocks/opticss.git $OPTICSS_DIR
+  cd $OPTICSS_DIR
+  lerna bootstrap --ci --registry=https://registry.npmjs.org/
 fi
-cd $OPTICSS_DIR
-lerna bootstrap --registry=https://registry.npmjs.org/
 lerna run compile
 cd -