Add embroider-safe

Author: cibernox

.github/workflows/build.yml

@@ -26,7 +26,7 @@ jobs:
           - ember-canary
           - ember-lts-3.16
           - ember-lts-3.20
-          # - embroider-safe
+          - embroider-safe
           # - embroider-optimized
 
     steps: