ci: update rustbook tests to use ENYZME_LOOSE_TYPES (#117)

* ci: update rustbook tests to use ENYZME_LOOSE_TYPES

* Update .github/workflows/enzyme-ci.yml

Co-authored-by: Jed Brown <[email protected]>

---------

Co-authored-by: Manuel Drehwald <[email protected]>

Author: jedbrown

.github/workflows/enzyme-ci.yml

@@ -62,4 +62,5 @@ jobs:
       - name: test Enzyme/rustbook
         working-directory: rustbook
         run: |
-          cargo +enzyme test --workspace
+          cargo +enzyme test
+          ENZYME_LOOSE_TYPES=1 cargo +enzyme test -p samples-loose-types